AMME: Function to estimate the average micro mediated effect...
In netmediate: Micro-Macro Analysis for Social Networks
AMME R Documentation
Function to estimate the average micro mediated effect (AMME).
Description
AMME implements parametric and nonparametric estimation routines to estimate the
average mediated micro effect. It requires two models. The first is a generative network model (i.e., a model where the dyad, dyad-time period, or dyad-group is the unit of analysis) of the form f(A_{ij}|T_{ij},Z_{ij}), where A is a cross-sectional or longitudinal network or group of longitudinal or cross-sectional networks, T is the possibly endogenous network selection process of interest and Z is a matrix of possibly endogenous confounding selection mechanisms.
The second model is a cross-sectional or longitudinal macro model (i.e., a model where the unit of analysis is a node, subgraph, or network or a combination of nodes, subgraphs, and networks measured collected from multiple settings [such as distinct schools or organizations]) of the form g(Y_i|M_{i},X_{i},T_{i}), where Y_i is the outcome variable, M_i is the mediating macro variable, X_i is a matrix of control variables that possibly vary as a function of selection process T_{ij}, and T_i is the optional unit-level measure of T_{ij}. The AMME is the change in Y_i when T_{ij} allowed to vary versus set to 0 because of an associated change in M_i. The AMME is given by
AMME=\frac{1}{2n} y_i(T_i(t),M_i(T_{ij}),X_i(t))-y_i(T_i(t),M_i(0),X_i(t))
, where n is the number of observations and t=0,T_{ij}. AMME currently accepts the following micro models: glm, glmer, ergm, btergm, sienaFit, rem.dyad, and netlogit objects. The following macro model objects are accepted: lm, glm, lmer, glmer, gam, plm, and lnam objects. Pooled estimation for multiple network models is also implemented for ergm and sienaFit micro models. Both parametric and nonparametric estimation are available.
Usage
AMME(micro_model,
macro_model,
micro_process,
mediator,
macro_function,
link_id,
object_type=NULL,
controls=NULL,
control_functions=NULL,
interval=c(0,1),
nsim=500,
algorithm="parametric",
silent=FALSE,
full_output=FALSE,
SAOM_data=NULL,
SAOM_var=NULL,
time_interval=NULL,
covar_list=NULL,
edgelist=NULL,
net_logit_y=NULL,
net_logit_x=NULL,
group_id=NULL,
node_numbers=NULL)
Arguments
micro_model
the micro-model. Currently accepts glm, glmer, ergm, btergm, sienaFit, rem.dyad, and netlogit objects. Pooled estimation for multiple network models is also implemented for ergm and sienaFit objects. To implement pooled estimation, model should be provided as a list of ergm or sienaFit objects.
macro_model
the macro model. Currently accepts lm, glm, lmer, glmer, gam, plm, and lnam objects.
micro_process
a character string containing the name of the micro process of interest. The character string should exactly match the relevant coefficient name in micro_model output.
mediator
a character string containing the name of the mediating variable of interest. The character string should exactly match the relevant coefficient name in macro_model output.
macro_function
a function that calculates mediator on the simulated networks. Currently accepts user defined functions as well as functions inherent in the igraph and statnet packages for R.
link_id
a required vector of IDs used to link the micro_model output to the macro_model input. If calculating a network-level mediator, this should be the network identifier or network-group/network-time period identifier. If calculating a node-level mediator, this should be the node ID or node-time-period/node-group identifier. Observations should correspond exactly to rows in the macro_model data matrix. If calculating multiple network statistics at different levels of analysis when controls are included, link_id may be provided as an ordered list of identifiers. In this case, each entry in the list is a vector of IDs corresponding to the unique entries of the relevant statistics. If provided as a list, the first entry should correspond to macro_function (i.e., the mediator) and the remaining entries should correspond to control_functions (i.e., the controls).
controls
a vector of character strings listing the control variables in macro_model that may vary as a function of micro_process. Each element in controls should correspond exactly to a coefficient in macro_model output. If controls is left NULL,then the AMME is calculated without controlling for confounding network variables.
control_functions
a list of functions used to calculate controls. The elements in control_functions should correspond exactly to the elements in controls and should be provided in the same order. If micro_process appears as an independent variable in macro_model, then this can be specified by specifying the netmediate helper function identity_function to control_functions.
object_type
A character string or vector of character strings that tells netmediate the type of object to apply the macro_function and control_functions to. If controls are included into the AMME call, then object_type should be provided as a vector of character strings where the first element is the object_type for macro_function and the remaining elements are the ordered object_type for control_functions. Currently accepts igraph and network objects. If left NULL, network objects are assumed. Can be over-ridden to use other object types with a user-function by defining a function that accepts either a network or igraph object and returns a numeric value or vector of numeric values (see examples).
interval
Tuning parameters to vary the strength of \theta. Should be provided as a vector of numeric values with 2 entries.
nsim
The number of simulations or bootstrap samples to use during estimation.
algorithm
The estimation algorithm to be used. Currently accepts "parametric" and "nonparametric". If "parametric", estimation is obtained with Monte Carlo sampling. If "nonparametric", estimation uses bootstrap resampling.
silent
logical parameter. Whether to provide updates on the progress of the simulation or not.
full_output
logical parameter. If set to TRUE, the entire distribution of simulated statistics will be provided as part of the model output.
SAOM_data
required when micro_model is a sienaFit object; ignored otherwise. If a sienaFit object is provided, SAOM_data should be the siena object that contains the data for SAOM estimation. If using pooled estimation on multiple sienaFit objects (i.e., providing a list of sienaFit objects), then SAOM_data should be provided as an ordered list with each entry containing the siena object corresponding to list of sienaFit objects.
SAOM_var
optional parameter when micro_model is a sienaFit object. SAOM_var is a list of of the varCovar and varDyadCovar objects used to assign time varying node and dyad covariates when calling sienaDataCreate. If provided, netmediate assigns the varying node covariates and dyad covariates to each simulated network. This parameter is required when macro_function computes a statistic that varies as a function of time varying node or dyad covariates (i.e., network segregation, assorativity). Time invariant characteristics (coCovar and coDyadCovar) are handled internally by MEMS and should not be provided. When providing a list of sienaFit objects for pooled estimation, SAOM_var should be provided as a list of lists, where each entry in the list contains a list of varCovar and varDyadCovar objects associated with corresponding sienaFit object.
time_interval
an optional parameter to be used when micro_model is a rem.dyad object. May be provided as a numeric vector or the character string "aggregate". If a numeric vector is provided unique network snapshots at each interval. For example, time_interval=c(0,2,3) would induce two networks, one for the 0 - 2 time period and one for the 2 - 3 time period. If specified as "aggregate", the AMME is calculated by creating an aggregated cross-sectional representation of the entire event sequence. If left NULL, defaults to |"aggregate". Note that time_interval must correspond to the time periods observed in macro_model. That is, time_interval must be set to "aggregate" when macro_model is cross-sectional and the entries in time_interval must correspond to the time periods observed in the repeated measurement data when macro_model is longitudinal.
covar_list
an optional list of sender/receiver covariates used in rem.dyad estimation. Only required when a rem.dyad object is the micro_model and covariates are in the rem.dyad call. The list format should correspond to the format required by rem.dyad.
edgelist
an optional three column edgelist providing the sender, receiver, and time of event occurrence when micro_model is a rem.dyad object. Only required when time_interval is set to NULL or "aggregate". Ignored for other types of models.
net_logit_y
the dependent variable when micro_model is a netlogit object. Should be provided as a vector.
net_logit_x
the matrix of independent variables when micro_model is a netlogit object
group_id
optional vector of group identifiers to use when micro_model is a glm or glmer on grouped data (i.e., multiple time periods, multiple networks). When specified, AMME will induce unique networks for each grouping factor. If left unspecified, all groups/time periods are pooled. If using glmer, the grouping factor does not have to be provided as part of the model or used as a random effect. If specified, the entries in the macro_model model matrix are assumed to be sequentially ordered by unit_id-group_id.
node_numbers
a numeric vector containing the number of nodes in each group_id when using glm or glmer. If estimating AMME aggregated over all networks (i.e., group_id=NULL), this shoud be the total number of nodes in all networks. Required when using glm or glmer, ignored otherwise.
Details
Estimates the AMME over the provided intervals. Standard errors and confidence intervals are based on the sampling distribution of simulated values, which are calculated either parametrically or nonparametrically according to algorithm. Parametric estimation is typically faster, but cannot be used for nonparametric network models (e.g., quadratic assignment procedure).
macro_function and control_functions make up the core utilites of AMME. macro_function calculates the mediating variable of interest, while control_functions calculates all control variables that vary as a function of micro_process and potentially confound the effect of mediator. When controls are left NULL, then AMME estimates the AMME without accounting for confounding variables. Specifying controls and control_functions ensures that estimates of the AMME account for alternative pathways from micro_process to the outcome variable in macro_model. In cases where micro_process is included as a predictor variable in macro_model, this can be specified by including the netmediate helper function identity_function into control_functions.
netmediate currently supports functions calculated on igraph and network objects, which should be specified using the object_type argument. These may be functions inherent to the statnet and igraph software package or they may be functions from other packages that accept network/igraph objects. The functions provided to macro_function and control_functions may also be user-defined functions that accept network or igraph objects as inputs and return a numeric value or vector of numeric values as output. It is also possible to over-ride the network and igraph object requirements within a user function. To do so, set the object_type argument (or relevant element within the object_type argument when object_type is a list) to either network or igraph and then define a user-function that accepts a network or igraph object as its input, converts the object to the desired data structure, calculates the statistic of interest, and returns a numeric value or vector of numeric values. See examples below for an illustration.
By default, the AMME is calculated by averaging over the distribution of simulated values. If full_output is set to TRUE, the distribution of simualted statistics is returned. This may be useful when the median or mode of the simulated distribution is required or if the researcher wants to inspect the distributional shape of simulated values.
AMME also supports pooled estimation for when multiple ergm or sienaFit objects are used as the micro_model. To use pooled estimation, the model parameter should be specified as a list of ergm or sienaFit objects. If using sienaFit, the SAOM_data argument will also need to be specified as an ordered list with elements corresponding to entries in the list of sienaFit objects. Similarly, the SAOM_var parameter will need to be specified as a list of lists, where each entry in the list is, itself, a list containing all varCovar and varDyadCovar objects used to calculate macro statistics of interest. Note that SAOM_var should not be provided if the macro statistic of interest is not a function of the variables contained in varCovar and varDyadCovar.
Value
If full_output=FALSE, then a table is returned with the AMME, its standard error, confidence interval, and p-value.
If full_output=TRUE, then a list is returned with the following three elements.
summary_dat
is the table of summary output ucontaining the AMME, its standard error, confidence interval, and p-value.
AMME_obs
is vector of observations where each entry is the AMME for a single simulation trial.
prop_explained_obs
is vector containing the proportion explained values for each simulation trial.
Author(s)
Duxbury, Scott W. Associate Professor, University of North Carolina–Chapel Hill, Department of Sociology.
References
Duxbury, Scott W. 2024. "Micro-macro Mediation Analysis in Social Networks." Sociological Methodology.
See Also
MEMS
ergm.mma
mediate
Examples
##############################
# Basic AMME specifications
#############################
####create ERGM generative model
library(statnet)
data("faux.mesa.high")
ergm_model<-ergm(faux.mesa.high~edges+
nodecov("Grade")+
nodefactor("Race")+
nodefactor("Sex")+
nodematch("Race")+
nodematch("Sex")+
absdiff("Grade"))
###create node-level data for second stage analysis with
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
race=faux.mesa.high%v%"Race",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high))
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high) #define ID for each observation
probit_model<-glm(senior~race+sex+degree,
data=node_level_data,
family=binomial(link="probit"))
###estimate the indirect effect of grade homophily on senior status acting through degree centrality
#in a model with no network control variables
AMME(micro_model=ergm_model,
macro_model=probit_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id, #specify vertex IDs
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
#use nonparametric estimation for a generalized additive model
library(gam)
gam_model<-gam(senior~race+sex+s(degree),
data=node_level_data)
AMME(micro_model=ergm_model,
macro_model=gam_model,
micro_process="absdiff.Grade",
mediator="s(degree)",
macro_function=degree,
link_id=node_level_data$v_id,
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="nonparametric",
silent=FALSE)
###estimate AMME with linear network autocorrelation model
lnam_model<-lnam(node_level_data$grade,
x=as.matrix(node_level_data[,4:5]),
W1=as.sociomatrix(faux.mesa.high))
AMME(micro_model=ergm_model,
macro_model=lnam_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id,
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
############################
# Including controls
###########################
##single control
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
race=faux.mesa.high%v%"Race",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high),
betweenness=betweenness(faux.mesa.high))
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high) #define ID for each observation
probit_model<-glm(senior~race+sex+degree+betweenness,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=ergm_model,
macro_model=probit_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id, #specify vertex IDs
controls="betweenness", #should match model output exactly
control_functions=betweenness,
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
##multiple controls
##include an AR 1 parameter to make it a nonlinear network autocorrelation model
node_level_data$AR1<-as.sociomatrix(faux.mesa.high)%*%node_level_data$senior
probit_model<-glm(senior~race+sex+degree+betweenness+AR1,
data=node_level_data,
family=binomial(link="probit"))
#specify user function
ar_function<-function(x){
return(as.sociomatrix(x)%*%node_level_data$senior)
}
AMME(micro_model=ergm_model,
macro_model=probit_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id,
controls=c("betweenness","AR1"), #should match model output exactly
control_functions=list(betweenness,ar_function), #provide functions as a list
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
##using identity_function when micro_process has a direct effect on y
#to use identity_function, the control and micro_process need to have the same
#name and the macro control variable has to be numeric
node_level_data$Sex<-as.numeric(as.factor(node_level_data$sex))
logit_model<-glm(senior~race+Sex+degree+betweenness+AR1,
data=node_level_data,
family=binomial)
AMME(micro_model=ergm_model,
macro_model=logit_model,
micro_process="nodefactor.Sex.M",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id,
controls=c("betweenness","AR1","Sex"), #should match model output exactly
control_functions=list(betweenness,ar_function,identity_function),
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
################################
# More complex data structures
###############################
###############################
# AMME with longitudinal data
##############################
#bootstrap TERGM and panel data model
library(btergm)
library(plm)
data(alliances)
ally_data<-list(LSP[[1]],
LSP[[2]],
LSP[[3]])
#fit bootstrap TERGM with 200 replications
bt_model<-btergm(ally_data~edges+
gwesp(.7,fixed=T)+
mutual,R=200)
#create node data
ally_node_data<-data.frame(outdeg=c(rowSums(LSP[[1]]),rowSums(LSP[[2]]),rowSums(LSP[[3]])),
indeg=c(colSums(LSP[[1]]),colSums(LSP[[2]]),colSums(LSP[[3]])))
ally_node_data$v_id<-rep(rownames(LSP[[1]]),3) #create node IDS
ally_node_data$t_id<-c(rep(1, nrow(ally_data[[1]])), #create time IDS
rep(2, nrow(ally_data[[1]])),
rep(3, nrow(ally_data[[1]])))
ally_node_data$link_id<-paste(ally_node_data$v_id,ally_node_data$t_id)#create node-panel identifiers
ally_node_data$v_id<-as.factor(as.character(ally_node_data$v_id))
#estimate a linear model with node fixed effects
lm_model<- lm(outdeg~indeg +v_id,
data = ally_node_data)
AMME(micro_model=bt_model,
macro_model=lm_model,
micro_process="gwesp.OTP.fixed.0.7",
mediator="indeg",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=ally_node_data$link_id, #provide node-panel identifiers
object_type="network",
interval=c(0,1),
nsim=11,
algorithm="nonparametric",
silent=FALSE)
##include controls at different units of analysis
#include global transitivity statistic at each network panel
transitivity_list<-c(gtrans(as.network(LSP[[1]])),
gtrans(as.network(LSP[[2]])),
gtrans(as.network(LSP[[3]])))
ally_node_data$transitivity<-c(rep(transitivity_list[1],nrow(LSP[[1]])),
rep(transitivity_list[2],nrow(LSP[[2]])),
rep(transitivity_list[3],nrow(LSP[[3]])))
lm_model<- lm(outdeg~indeg+transitivity +v_id,
data = ally_node_data)
AMME(micro_model=bt_model,
macro_model=lm_model,
micro_process="gwesp.OTP.fixed.0.7",
mediator="indeg",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=list(ally_node_data$link_id,ally_node_data$t_id),#list of IDs for nodes and time
controls="transitivity",
control_functions = gtrans,
object_type="network",
interval=c(0,1),
nsim=11,
algorithm="nonparametric",
silent=FALSE)
#SAOM and panel data model with PLM package
library(RSiena)
#specify 3 wave network panel data as DV
network_list<-array(c(s501,s502,s503),dim = c(50,50,3))
Network<-sienaDependent(network_list)
Smoking<-varCovar(s50s)
Alcohol<-varCovar(s50a)
SAOM.Data<-sienaDataCreate(Network=Network,Smoking,Alcohol)
#specify
SAOM.terms<-getEffects(SAOM.Data)
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Alcohol")
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Smoking")
SAOM.terms<-includeEffects(SAOM.terms,transTies,inPop)
create.model<-sienaAlgorithmCreate(projname="netmediate",
nsub=5,
n3=2000)
##estimate the SAOM
SAOM_model<-siena07(create.model,
data=SAOM.Data,
effects=SAOM.terms,
verbose=TRUE)
##create node-level data
node_level_data<-data.frame(smoking=s50s[,1], #smoking behavior for DV
alcohol=s50a[,1],
v_id=rownames(s501), #unique node IDS
wave="Wave 1", #unique time IDS
outdegree=rowSums(s501),
indegree=colSums(s501),
AR1=s501%*%s50s[,1], #assign network autocorrelation
gcc=gtrans(as.network(s501)))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,2],
alcohol=s50a[,2],
v_id=rownames(s502),
wave="Wave 2",
outdegree=rowSums(s502),
indegree=colSums(s502),
AR1=s502%*%s50s[,2],
gcc=gtrans(as.network(s502))))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,3],
alcohol=s50a[,3],
v_id=rownames(s503),
wave="Wave 3",
outdegree=rowSums(s503),
indegree=colSums(s503),
AR1=s503%*%s50s[,3],
gcc=gtrans(as.network(s503))))
##create unique identifiers for node-panel
node_level_data$unique_ids<-paste(node_level_data$v_id,node_level_data$wave)
##estimate one-way fixed effects model with PLM
library(plm)
FE_model<-plm(smoking~alcohol+outdegree+indegree+AR1+gcc,
data=node_level_data,
index=c("v_id","wave"))
##create AR function to provide to AMME
ar_function<-function(x){return(as.sociomatrix(x)%*%(x%v%"Smoking"))}
AMME(micro_model=SAOM_model,
macro_model=FE_model,
micro_process="reciprocity",
mediator="indegree",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=list(node_level_data$unique_id,node_level_data$unique_id,
node_level_data$unique_id,node_level_data$wave),
object_type="network",
controls=c("outdegree","AR1","gcc"),
control_functions=list(function(x){degree(x,cmode="outdegree")},ar_function,gtrans),
interval=c(0,.1),
nsim=500,
algorithm="parametric",
silent=FALSE,
SAOM_data = SAOM.Data,
SAOM_var=list(Smoking=Smoking,Alcohol=Alcohol)) #provide var_list
################################
# AMME with pooled ERGM and SAOM
################################
#pooled ERGM
#fit two ERGMs to two networks
data("faux.mesa.high")
model1<-ergm(faux.mesa.high~edges+
nodecov("Grade")+
nodefactor("Race")+
nodefactor("Sex")+
nodematch("Race")+
nodematch("Sex")+
absdiff("Grade"))
data("faux.magnolia.high")
model2<-ergm(faux.magnolia.high~edges+
nodecov("Grade")+
nodefactor("Race")+
nodefactor("Sex")+
nodematch("Race")+
nodematch("Sex")+
absdiff("Grade"))
#create node level data
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high),
betweenness=betweenness(faux.mesa.high),
gcc=gtrans(faux.mesa.high),
net_id="Mesa")
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high)
node_level_data2<-data.frame(grade=faux.magnolia.high%v%"Grade",
sex=faux.magnolia.high%v%"Sex",
degree=degree(faux.magnolia.high),
betweenness=betweenness(faux.magnolia.high),
gcc=gtrans(faux.magnolia.high),
net_id="Magnolia")
node_level_data2$senior<-0
node_level_data2$senior[node_level_data$grade==max(node_level_data2$grade)]<-1
node_level_data2$v_id<-206:(network.size(faux.magnolia.high)+205)
node_level_data<-rbind(node_level_data,node_level_data2)
#estimate glm macro model with an AR 1 process
probit_model<-glm(senior~sex+degree+betweenness+gcc,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=list(model1,model2),
macro_model=probit_model,
micro_process="nodematch.Sex",
mediator="degree",
macro_function=degree,
link_id=list(node_level_data$v_id,node_level_data$v_id,node_level_data$net_id),
object_type="network",
controls=c("betweenness","gcc"),
control_functions=list(betweenness,gtrans),
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
##pooled SAOM with control functions using time varying covariates
library(RSiena)
#specify 3 wave network panel data as DV
network_list<-array(c(s501,s502,s503),dim = c(50,50,3))
Network<-sienaDependent(network_list)
Smoking<-varCovar(s50s)
Alcohol<-varCovar(s50a)
SAOM.Data<-sienaDataCreate(Network=Network,Smoking,Alcohol)
#specify
SAOM.terms<-getEffects(SAOM.Data)
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Alcohol")
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Smoking")
SAOM.terms<-includeEffects(SAOM.terms,transTies,inPop)
create.model<-sienaAlgorithmCreate(projname="netmediate",
nsub=5,
n3=2000)
##estimate the SAOM
SAOM_model<-siena07(create.model,
data=SAOM.Data,
effects=SAOM.terms,
verbose=TRUE)
##create node-level data
node_level_data<-data.frame(smoking=s50s[,1], #smoking behavior for DV
alcohol=s50a[,1],
v_id=rownames(s501), #unique node IDS
wave="Wave 1", #unique time IDS
outdegree=rowSums(s501),
indegree=colSums(s501),
AR1=s501%*%s50s[,1], #assign network autocorrelation
gcc=gtrans(as.network(s501)))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,2],
alcohol=s50a[,2],
v_id=rownames(s502),
wave="Wave 2",
outdegree=rowSums(s502),
indegree=colSums(s502),
AR1=s502%*%s50s[,2],
gcc=gtrans(as.network(s502))))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,3],
alcohol=s50a[,3],
v_id=rownames(s503),
wave="Wave 3",
outdegree=rowSums(s503),
indegree=colSums(s503),
AR1=s503%*%s50s[,3],
gcc=gtrans(as.network(s503))))
#recycle the same model for illustrative purposes
node_level_data$net_ID<-"Model 1"
node_level_data<-rbind(node_level_data,node_level_data)
node_level_data$net_ID[151:300]<-"Model 2"
##create unique identifiers for node-panel
#ID for node-panel-model
node_level_data$unique_id<-paste(node_level_data$v_id,node_level_data$wave,node_level_data$net_ID)
#ID for panel-model
node_level_data$unique_waves<-paste(node_level_data$wave,node_level_data$net_ID)
#estimate a linear network autocorrelation model with node fixed effects
FE_model<-lm(smoking~alcohol+outdegree+indegree+AR1+gcc+v_id,
data=node_level_data)
##create user function calculate AR1 process on time varying node attributes
ar_function<-function(x){return(as.sociomatrix(x)%*%(x%v%"Smoking"))}
##estimate AMME
AMME(micro_model=list(SAOM_model,SAOM_model), #provide list of sienaFit objects
macro_model=FE_model,
micro_process="reciprocity",
mediator="indegree",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=list(node_level_data$unique_id,node_level_data$unique_id,
node_level_data$unique_id,node_level_data$unique_waves),
object_type="network",
controls=c("outdegree","AR1","gcc"),
control_functions=list(function(x){degree(x,cmode="outdegree")},ar_function,gtrans),
interval=c(0,.1),
nsim=100, #parametric estimation requires more simulations than coefficients
algorithm="parametric",
silent=FALSE,
SAOM_data = list(SAOM.Data,SAOM.Data), #list of siena objects
SAOM_var=list(list(Smoking=Smoking,Alcohol=Alcohol),#provide var_list
list(Smoking=Smoking,Alcohol=Alcohol)))
#################################
# AMME with nested data
################################
####create dyad-level data
library(lme4)
library(btergm)
##use small data to simplify estimation
glm_dat<-edgeprob(model1)
glm_dat$net_id<-"mesa"
glm_dat2<-edgeprob(model2)
glm_dat2$net_id<-"magnolia"
glm_dat<-rbind(glm_dat,glm_dat2[,-c(4)])
##estimate micro model as glm for btoh networks using pooled ERGM data
net_glm<-glm(tie~nodecov.Grade+
nodefactor.Race.Hisp+
nodefactor.Race.NatAm+
nodefactor.Race.Other+
nodefactor.Sex.M+
nodematch.Race+
nodematch.Sex+
absdiff.Grade,
data=glm_dat)
#create macro data
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high),
betweenness=betweenness(faux.mesa.high),
gcc=gtrans(faux.mesa.high),
net_id="Mesa")
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high)
node_level_data2<-data.frame(grade=faux.magnolia.high%v%"Grade",
sex=faux.magnolia.high%v%"Sex",
degree=degree(faux.magnolia.high),
betweenness=betweenness(faux.magnolia.high),
gcc=gtrans(faux.magnolia.high),
net_id="Magnolia")
node_level_data2$senior<-0
node_level_data2$senior[node_level_data$grade==max(node_level_data2$grade)]<-1
node_level_data2$v_id<-206:(network.size(faux.magnolia.high)+205)
node_level_data<-rbind(node_level_data,node_level_data2)
#estimate glm macro model
probit_model<-glm(senior~sex+degree+betweenness+gcc,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=net_glm,
macro_model=probit_model,
micro_process="nodematch.Sex",
mediator="degree",
macro_function=degree,
link_id=list(node_level_data$v_id,node_level_data$v_id,node_level_data$net_id),
object_type="network",
controls=c("betweenness","gcc"),
control_functions=list(betweenness,gtrans),
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE,
group_id=glm_dat$net_id,
node_numbers = c(network.size(faux.mesa.high),
network.size(faux.magnolia.high)))
###using glmer for micro model
net_glmer<-glmer(tie~nodecov.Grade+
nodefactor.Race.Hisp+
nodefactor.Race.NatAm+
nodefactor.Race.Other+
nodefactor.Sex.M+
nodematch.Race+
nodematch.Sex+
absdiff.Grade+
(1|net_id),
data=glm_dat)
probit_glmer<-glm(senior~sex+degree+betweenness+gcc,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=net_glm,
macro_model=probit_glmer,
micro_process="nodematch.Sex",
mediator="degree",
macro_function=degree,
link_id=list(node_level_data$v_id,node_level_data$v_id,node_level_data$net_id),
object_type="network",
controls=c("betweenness","gcc"),
control_functions=list(betweenness,gtrans),
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE,
group_id=glm_dat$net_id,
node_numbers = c(network.size(faux.mesa.high),
network.size(faux.magnolia.high)))
netmediate documentation built on June 22, 2024, 9:53 a.m.
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| AMME | R Documentation |
Function to estimate the average micro mediated effect (AMME).
Description
AMME implements parametric and nonparametric estimation routines to estimate the
average mediated micro effect. It requires two models. The first is a generative network model (i.e., a model where the dyad, dyad-time period, or dyad-group is the unit of analysis) of the form f(A_{ij}|T_{ij},Z_{ij}), where A is a cross-sectional or longitudinal network or group of longitudinal or cross-sectional networks, T is the possibly endogenous network selection process of interest and Z is a matrix of possibly endogenous confounding selection mechanisms.
The second model is a cross-sectional or longitudinal macro model (i.e., a model where the unit of analysis is a node, subgraph, or network or a combination of nodes, subgraphs, and networks measured collected from multiple settings [such as distinct schools or organizations]) of the form g(Y_i|M_{i},X_{i},T_{i}), where Y_i is the outcome variable, M_i is the mediating macro variable, X_i is a matrix of control variables that possibly vary as a function of selection process T_{ij}, and T_i is the optional unit-level measure of T_{ij}. The AMME is the change in Y_i when T_{ij} allowed to vary versus set to 0 because of an associated change in M_i. The AMME is given by
AMME=\frac{1}{2n} y_i(T_i(t),M_i(T_{ij}),X_i(t))-y_i(T_i(t),M_i(0),X_i(t))
, where n is the number of observations and t=0,T_{ij}. AMME currently accepts the following micro models: glm, glmer, ergm, btergm, sienaFit, rem.dyad, and netlogit objects. The following macro model objects are accepted: lm, glm, lmer, glmer, gam, plm, and lnam objects. Pooled estimation for multiple network models is also implemented for ergm and sienaFit micro models. Both parametric and nonparametric estimation are available.
Usage
AMME(micro_model,
macro_model,
micro_process,
mediator,
macro_function,
link_id,
object_type=NULL,
controls=NULL,
control_functions=NULL,
interval=c(0,1),
nsim=500,
algorithm="parametric",
silent=FALSE,
full_output=FALSE,
SAOM_data=NULL,
SAOM_var=NULL,
time_interval=NULL,
covar_list=NULL,
edgelist=NULL,
net_logit_y=NULL,
net_logit_x=NULL,
group_id=NULL,
node_numbers=NULL)
Arguments
micro_model |
the micro-model. Currently accepts |
macro_model |
the macro model. Currently accepts |
micro_process |
a character string containing the name of the micro process of interest. The character string should exactly match the relevant coefficient name in |
mediator |
a character string containing the name of the mediating variable of interest. The character string should exactly match the relevant coefficient name in |
macro_function |
a |
link_id |
a required vector of IDs used to link the |
controls |
a vector of character strings listing the control variables in |
control_functions |
a list of functions used to calculate |
object_type |
A character string or vector of character strings that tells |
interval |
Tuning parameters to vary the strength of |
nsim |
The number of simulations or bootstrap samples to use during estimation. |
algorithm |
The estimation algorithm to be used. Currently accepts |
silent |
logical parameter. Whether to provide updates on the progress of the simulation or not. |
full_output |
logical parameter. If set to |
SAOM_data |
required when |
SAOM_var |
optional parameter when |
time_interval |
an optional parameter to be used when |
covar_list |
an optional list of sender/receiver covariates used in |
edgelist |
an optional three column edgelist providing the sender, receiver, and time of event occurrence when |
net_logit_y |
the dependent variable when |
net_logit_x |
the matrix of independent variables when |
group_id |
optional vector of group identifiers to use when |
node_numbers |
a numeric vector containing the number of nodes in each group_id when using |
Details
Estimates the AMME over the provided intervals. Standard errors and confidence intervals are based on the sampling distribution of simulated values, which are calculated either parametrically or nonparametrically according to algorithm. Parametric estimation is typically faster, but cannot be used for nonparametric network models (e.g., quadratic assignment procedure).
macro_function and control_functions make up the core utilites of AMME. macro_function calculates the mediating variable of interest, while control_functions calculates all control variables that vary as a function of micro_process and potentially confound the effect of mediator. When controls are left NULL, then AMME estimates the AMME without accounting for confounding variables. Specifying controls and control_functions ensures that estimates of the AMME account for alternative pathways from micro_process to the outcome variable in macro_model. In cases where micro_process is included as a predictor variable in macro_model, this can be specified by including the netmediate helper function identity_function into control_functions.
netmediate currently supports functions calculated on igraph and network objects, which should be specified using the object_type argument. These may be functions inherent to the statnet and igraph software package or they may be functions from other packages that accept network/igraph objects. The functions provided to macro_function and control_functions may also be user-defined functions that accept network or igraph objects as inputs and return a numeric value or vector of numeric values as output. It is also possible to over-ride the network and igraph object requirements within a user function. To do so, set the object_type argument (or relevant element within the object_type argument when object_type is a list) to either network or igraph and then define a user-function that accepts a network or igraph object as its input, converts the object to the desired data structure, calculates the statistic of interest, and returns a numeric value or vector of numeric values. See examples below for an illustration.
By default, the AMME is calculated by averaging over the distribution of simulated values. If full_output is set to TRUE, the distribution of simualted statistics is returned. This may be useful when the median or mode of the simulated distribution is required or if the researcher wants to inspect the distributional shape of simulated values.
AMME also supports pooled estimation for when multiple ergm or sienaFit objects are used as the micro_model. To use pooled estimation, the model parameter should be specified as a list of ergm or sienaFit objects. If using sienaFit, the SAOM_data argument will also need to be specified as an ordered list with elements corresponding to entries in the list of sienaFit objects. Similarly, the SAOM_var parameter will need to be specified as a list of lists, where each entry in the list is, itself, a list containing all varCovar and varDyadCovar objects used to calculate macro statistics of interest. Note that SAOM_var should not be provided if the macro statistic of interest is not a function of the variables contained in varCovar and varDyadCovar.
Value
If full_output=FALSE, then a table is returned with the AMME, its standard error, confidence interval, and p-value.
If full_output=TRUE, then a list is returned with the following three elements.
summary_dat |
is the table of summary output ucontaining the AMME, its standard error, confidence interval, and p-value. |
AMME_obs |
is vector of observations where each entry is the AMME for a single simulation trial. |
prop_explained_obs |
is vector containing the proportion explained values for each simulation trial. |
Author(s)
Duxbury, Scott W. Associate Professor, University of North Carolina–Chapel Hill, Department of Sociology.
References
Duxbury, Scott W. 2024. "Micro-macro Mediation Analysis in Social Networks." Sociological Methodology.
See Also
MEMS
ergm.mma
mediate
Examples
##############################
# Basic AMME specifications
#############################
####create ERGM generative model
library(statnet)
data("faux.mesa.high")
ergm_model<-ergm(faux.mesa.high~edges+
nodecov("Grade")+
nodefactor("Race")+
nodefactor("Sex")+
nodematch("Race")+
nodematch("Sex")+
absdiff("Grade"))
###create node-level data for second stage analysis with
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
race=faux.mesa.high%v%"Race",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high))
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high) #define ID for each observation
probit_model<-glm(senior~race+sex+degree,
data=node_level_data,
family=binomial(link="probit"))
###estimate the indirect effect of grade homophily on senior status acting through degree centrality
#in a model with no network control variables
AMME(micro_model=ergm_model,
macro_model=probit_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id, #specify vertex IDs
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
#use nonparametric estimation for a generalized additive model
library(gam)
gam_model<-gam(senior~race+sex+s(degree),
data=node_level_data)
AMME(micro_model=ergm_model,
macro_model=gam_model,
micro_process="absdiff.Grade",
mediator="s(degree)",
macro_function=degree,
link_id=node_level_data$v_id,
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="nonparametric",
silent=FALSE)
###estimate AMME with linear network autocorrelation model
lnam_model<-lnam(node_level_data$grade,
x=as.matrix(node_level_data[,4:5]),
W1=as.sociomatrix(faux.mesa.high))
AMME(micro_model=ergm_model,
macro_model=lnam_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id,
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
############################
# Including controls
###########################
##single control
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
race=faux.mesa.high%v%"Race",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high),
betweenness=betweenness(faux.mesa.high))
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high) #define ID for each observation
probit_model<-glm(senior~race+sex+degree+betweenness,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=ergm_model,
macro_model=probit_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id, #specify vertex IDs
controls="betweenness", #should match model output exactly
control_functions=betweenness,
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
##multiple controls
##include an AR 1 parameter to make it a nonlinear network autocorrelation model
node_level_data$AR1<-as.sociomatrix(faux.mesa.high)%*%node_level_data$senior
probit_model<-glm(senior~race+sex+degree+betweenness+AR1,
data=node_level_data,
family=binomial(link="probit"))
#specify user function
ar_function<-function(x){
return(as.sociomatrix(x)%*%node_level_data$senior)
}
AMME(micro_model=ergm_model,
macro_model=probit_model,
micro_process="absdiff.Grade",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id,
controls=c("betweenness","AR1"), #should match model output exactly
control_functions=list(betweenness,ar_function), #provide functions as a list
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
##using identity_function when micro_process has a direct effect on y
#to use identity_function, the control and micro_process need to have the same
#name and the macro control variable has to be numeric
node_level_data$Sex<-as.numeric(as.factor(node_level_data$sex))
logit_model<-glm(senior~race+Sex+degree+betweenness+AR1,
data=node_level_data,
family=binomial)
AMME(micro_model=ergm_model,
macro_model=logit_model,
micro_process="nodefactor.Sex.M",
mediator="degree",
macro_function=degree,
link_id=node_level_data$v_id,
controls=c("betweenness","AR1","Sex"), #should match model output exactly
control_functions=list(betweenness,ar_function,identity_function),
object_type="network",
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
################################
# More complex data structures
###############################
###############################
# AMME with longitudinal data
##############################
#bootstrap TERGM and panel data model
library(btergm)
library(plm)
data(alliances)
ally_data<-list(LSP[[1]],
LSP[[2]],
LSP[[3]])
#fit bootstrap TERGM with 200 replications
bt_model<-btergm(ally_data~edges+
gwesp(.7,fixed=T)+
mutual,R=200)
#create node data
ally_node_data<-data.frame(outdeg=c(rowSums(LSP[[1]]),rowSums(LSP[[2]]),rowSums(LSP[[3]])),
indeg=c(colSums(LSP[[1]]),colSums(LSP[[2]]),colSums(LSP[[3]])))
ally_node_data$v_id<-rep(rownames(LSP[[1]]),3) #create node IDS
ally_node_data$t_id<-c(rep(1, nrow(ally_data[[1]])), #create time IDS
rep(2, nrow(ally_data[[1]])),
rep(3, nrow(ally_data[[1]])))
ally_node_data$link_id<-paste(ally_node_data$v_id,ally_node_data$t_id)#create node-panel identifiers
ally_node_data$v_id<-as.factor(as.character(ally_node_data$v_id))
#estimate a linear model with node fixed effects
lm_model<- lm(outdeg~indeg +v_id,
data = ally_node_data)
AMME(micro_model=bt_model,
macro_model=lm_model,
micro_process="gwesp.OTP.fixed.0.7",
mediator="indeg",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=ally_node_data$link_id, #provide node-panel identifiers
object_type="network",
interval=c(0,1),
nsim=11,
algorithm="nonparametric",
silent=FALSE)
##include controls at different units of analysis
#include global transitivity statistic at each network panel
transitivity_list<-c(gtrans(as.network(LSP[[1]])),
gtrans(as.network(LSP[[2]])),
gtrans(as.network(LSP[[3]])))
ally_node_data$transitivity<-c(rep(transitivity_list[1],nrow(LSP[[1]])),
rep(transitivity_list[2],nrow(LSP[[2]])),
rep(transitivity_list[3],nrow(LSP[[3]])))
lm_model<- lm(outdeg~indeg+transitivity +v_id,
data = ally_node_data)
AMME(micro_model=bt_model,
macro_model=lm_model,
micro_process="gwesp.OTP.fixed.0.7",
mediator="indeg",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=list(ally_node_data$link_id,ally_node_data$t_id),#list of IDs for nodes and time
controls="transitivity",
control_functions = gtrans,
object_type="network",
interval=c(0,1),
nsim=11,
algorithm="nonparametric",
silent=FALSE)
#SAOM and panel data model with PLM package
library(RSiena)
#specify 3 wave network panel data as DV
network_list<-array(c(s501,s502,s503),dim = c(50,50,3))
Network<-sienaDependent(network_list)
Smoking<-varCovar(s50s)
Alcohol<-varCovar(s50a)
SAOM.Data<-sienaDataCreate(Network=Network,Smoking,Alcohol)
#specify
SAOM.terms<-getEffects(SAOM.Data)
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Alcohol")
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Smoking")
SAOM.terms<-includeEffects(SAOM.terms,transTies,inPop)
create.model<-sienaAlgorithmCreate(projname="netmediate",
nsub=5,
n3=2000)
##estimate the SAOM
SAOM_model<-siena07(create.model,
data=SAOM.Data,
effects=SAOM.terms,
verbose=TRUE)
##create node-level data
node_level_data<-data.frame(smoking=s50s[,1], #smoking behavior for DV
alcohol=s50a[,1],
v_id=rownames(s501), #unique node IDS
wave="Wave 1", #unique time IDS
outdegree=rowSums(s501),
indegree=colSums(s501),
AR1=s501%*%s50s[,1], #assign network autocorrelation
gcc=gtrans(as.network(s501)))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,2],
alcohol=s50a[,2],
v_id=rownames(s502),
wave="Wave 2",
outdegree=rowSums(s502),
indegree=colSums(s502),
AR1=s502%*%s50s[,2],
gcc=gtrans(as.network(s502))))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,3],
alcohol=s50a[,3],
v_id=rownames(s503),
wave="Wave 3",
outdegree=rowSums(s503),
indegree=colSums(s503),
AR1=s503%*%s50s[,3],
gcc=gtrans(as.network(s503))))
##create unique identifiers for node-panel
node_level_data$unique_ids<-paste(node_level_data$v_id,node_level_data$wave)
##estimate one-way fixed effects model with PLM
library(plm)
FE_model<-plm(smoking~alcohol+outdegree+indegree+AR1+gcc,
data=node_level_data,
index=c("v_id","wave"))
##create AR function to provide to AMME
ar_function<-function(x){return(as.sociomatrix(x)%*%(x%v%"Smoking"))}
AMME(micro_model=SAOM_model,
macro_model=FE_model,
micro_process="reciprocity",
mediator="indegree",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=list(node_level_data$unique_id,node_level_data$unique_id,
node_level_data$unique_id,node_level_data$wave),
object_type="network",
controls=c("outdegree","AR1","gcc"),
control_functions=list(function(x){degree(x,cmode="outdegree")},ar_function,gtrans),
interval=c(0,.1),
nsim=500,
algorithm="parametric",
silent=FALSE,
SAOM_data = SAOM.Data,
SAOM_var=list(Smoking=Smoking,Alcohol=Alcohol)) #provide var_list
################################
# AMME with pooled ERGM and SAOM
################################
#pooled ERGM
#fit two ERGMs to two networks
data("faux.mesa.high")
model1<-ergm(faux.mesa.high~edges+
nodecov("Grade")+
nodefactor("Race")+
nodefactor("Sex")+
nodematch("Race")+
nodematch("Sex")+
absdiff("Grade"))
data("faux.magnolia.high")
model2<-ergm(faux.magnolia.high~edges+
nodecov("Grade")+
nodefactor("Race")+
nodefactor("Sex")+
nodematch("Race")+
nodematch("Sex")+
absdiff("Grade"))
#create node level data
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high),
betweenness=betweenness(faux.mesa.high),
gcc=gtrans(faux.mesa.high),
net_id="Mesa")
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high)
node_level_data2<-data.frame(grade=faux.magnolia.high%v%"Grade",
sex=faux.magnolia.high%v%"Sex",
degree=degree(faux.magnolia.high),
betweenness=betweenness(faux.magnolia.high),
gcc=gtrans(faux.magnolia.high),
net_id="Magnolia")
node_level_data2$senior<-0
node_level_data2$senior[node_level_data$grade==max(node_level_data2$grade)]<-1
node_level_data2$v_id<-206:(network.size(faux.magnolia.high)+205)
node_level_data<-rbind(node_level_data,node_level_data2)
#estimate glm macro model with an AR 1 process
probit_model<-glm(senior~sex+degree+betweenness+gcc,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=list(model1,model2),
macro_model=probit_model,
micro_process="nodematch.Sex",
mediator="degree",
macro_function=degree,
link_id=list(node_level_data$v_id,node_level_data$v_id,node_level_data$net_id),
object_type="network",
controls=c("betweenness","gcc"),
control_functions=list(betweenness,gtrans),
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE)
##pooled SAOM with control functions using time varying covariates
library(RSiena)
#specify 3 wave network panel data as DV
network_list<-array(c(s501,s502,s503),dim = c(50,50,3))
Network<-sienaDependent(network_list)
Smoking<-varCovar(s50s)
Alcohol<-varCovar(s50a)
SAOM.Data<-sienaDataCreate(Network=Network,Smoking,Alcohol)
#specify
SAOM.terms<-getEffects(SAOM.Data)
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Alcohol")
SAOM.terms<-includeEffects(SAOM.terms,egoX,altX,sameX,interaction1="Smoking")
SAOM.terms<-includeEffects(SAOM.terms,transTies,inPop)
create.model<-sienaAlgorithmCreate(projname="netmediate",
nsub=5,
n3=2000)
##estimate the SAOM
SAOM_model<-siena07(create.model,
data=SAOM.Data,
effects=SAOM.terms,
verbose=TRUE)
##create node-level data
node_level_data<-data.frame(smoking=s50s[,1], #smoking behavior for DV
alcohol=s50a[,1],
v_id=rownames(s501), #unique node IDS
wave="Wave 1", #unique time IDS
outdegree=rowSums(s501),
indegree=colSums(s501),
AR1=s501%*%s50s[,1], #assign network autocorrelation
gcc=gtrans(as.network(s501)))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,2],
alcohol=s50a[,2],
v_id=rownames(s502),
wave="Wave 2",
outdegree=rowSums(s502),
indegree=colSums(s502),
AR1=s502%*%s50s[,2],
gcc=gtrans(as.network(s502))))
node_level_data<-rbind(node_level_data,data.frame(smoking=s50s[,3],
alcohol=s50a[,3],
v_id=rownames(s503),
wave="Wave 3",
outdegree=rowSums(s503),
indegree=colSums(s503),
AR1=s503%*%s50s[,3],
gcc=gtrans(as.network(s503))))
#recycle the same model for illustrative purposes
node_level_data$net_ID<-"Model 1"
node_level_data<-rbind(node_level_data,node_level_data)
node_level_data$net_ID[151:300]<-"Model 2"
##create unique identifiers for node-panel
#ID for node-panel-model
node_level_data$unique_id<-paste(node_level_data$v_id,node_level_data$wave,node_level_data$net_ID)
#ID for panel-model
node_level_data$unique_waves<-paste(node_level_data$wave,node_level_data$net_ID)
#estimate a linear network autocorrelation model with node fixed effects
FE_model<-lm(smoking~alcohol+outdegree+indegree+AR1+gcc+v_id,
data=node_level_data)
##create user function calculate AR1 process on time varying node attributes
ar_function<-function(x){return(as.sociomatrix(x)%*%(x%v%"Smoking"))}
##estimate AMME
AMME(micro_model=list(SAOM_model,SAOM_model), #provide list of sienaFit objects
macro_model=FE_model,
micro_process="reciprocity",
mediator="indegree",
macro_function=function(x){degree(x,cmode="indegree")},
link_id=list(node_level_data$unique_id,node_level_data$unique_id,
node_level_data$unique_id,node_level_data$unique_waves),
object_type="network",
controls=c("outdegree","AR1","gcc"),
control_functions=list(function(x){degree(x,cmode="outdegree")},ar_function,gtrans),
interval=c(0,.1),
nsim=100, #parametric estimation requires more simulations than coefficients
algorithm="parametric",
silent=FALSE,
SAOM_data = list(SAOM.Data,SAOM.Data), #list of siena objects
SAOM_var=list(list(Smoking=Smoking,Alcohol=Alcohol),#provide var_list
list(Smoking=Smoking,Alcohol=Alcohol)))
#################################
# AMME with nested data
################################
####create dyad-level data
library(lme4)
library(btergm)
##use small data to simplify estimation
glm_dat<-edgeprob(model1)
glm_dat$net_id<-"mesa"
glm_dat2<-edgeprob(model2)
glm_dat2$net_id<-"magnolia"
glm_dat<-rbind(glm_dat,glm_dat2[,-c(4)])
##estimate micro model as glm for btoh networks using pooled ERGM data
net_glm<-glm(tie~nodecov.Grade+
nodefactor.Race.Hisp+
nodefactor.Race.NatAm+
nodefactor.Race.Other+
nodefactor.Sex.M+
nodematch.Race+
nodematch.Sex+
absdiff.Grade,
data=glm_dat)
#create macro data
node_level_data<-data.frame(grade=faux.mesa.high%v%"Grade",
sex=faux.mesa.high%v%"Sex",
degree=degree(faux.mesa.high),
betweenness=betweenness(faux.mesa.high),
gcc=gtrans(faux.mesa.high),
net_id="Mesa")
node_level_data$senior<-0
node_level_data$senior[node_level_data$grade==max(node_level_data$grade)]<-1
node_level_data$v_id<-1:network.size(faux.mesa.high)
node_level_data2<-data.frame(grade=faux.magnolia.high%v%"Grade",
sex=faux.magnolia.high%v%"Sex",
degree=degree(faux.magnolia.high),
betweenness=betweenness(faux.magnolia.high),
gcc=gtrans(faux.magnolia.high),
net_id="Magnolia")
node_level_data2$senior<-0
node_level_data2$senior[node_level_data$grade==max(node_level_data2$grade)]<-1
node_level_data2$v_id<-206:(network.size(faux.magnolia.high)+205)
node_level_data<-rbind(node_level_data,node_level_data2)
#estimate glm macro model
probit_model<-glm(senior~sex+degree+betweenness+gcc,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=net_glm,
macro_model=probit_model,
micro_process="nodematch.Sex",
mediator="degree",
macro_function=degree,
link_id=list(node_level_data$v_id,node_level_data$v_id,node_level_data$net_id),
object_type="network",
controls=c("betweenness","gcc"),
control_functions=list(betweenness,gtrans),
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE,
group_id=glm_dat$net_id,
node_numbers = c(network.size(faux.mesa.high),
network.size(faux.magnolia.high)))
###using glmer for micro model
net_glmer<-glmer(tie~nodecov.Grade+
nodefactor.Race.Hisp+
nodefactor.Race.NatAm+
nodefactor.Race.Other+
nodefactor.Sex.M+
nodematch.Race+
nodematch.Sex+
absdiff.Grade+
(1|net_id),
data=glm_dat)
probit_glmer<-glm(senior~sex+degree+betweenness+gcc,
data=node_level_data,
family=binomial(link="probit"))
AMME(micro_model=net_glm,
macro_model=probit_glmer,
micro_process="nodematch.Sex",
mediator="degree",
macro_function=degree,
link_id=list(node_level_data$v_id,node_level_data$v_id,node_level_data$net_id),
object_type="network",
controls=c("betweenness","gcc"),
control_functions=list(betweenness,gtrans),
interval=c(0,1),
nsim=50,
algorithm="parametric",
silent=FALSE,
group_id=glm_dat$net_id,
node_numbers = c(network.size(faux.mesa.high),
network.size(faux.magnolia.high)))
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