as_tbl_graph.digram.object: Create a tidygraph object from a digram.object

In jeppebundsgaard/RDigram: Analysis of Items from Tests and Surveys

Create a tidygraph object from a digram.object

Description

Create a tidygraph object from a digram.object

Usage

as_tbl_graph(do)

Arguments

do	A digram.object.
LD	A data.frame with columns for item1, item2 and gamma coefficient. Items can be variable.names, variable.columns or item numbers.
DIF	A data.frame with columns for item, exogenous variable and gamma coefficient. Items and exogenous variables can be variable.names, variable.columns or item numbers.
summarize.testlets	If true, don't collapse testlets, but summarize number of local dependent item pairs (both ways) in each testlet.

Value

Returns a tbl_graph

See Also

tidygraph::as_tbl_graph()

Examples

library(ggraph)
library(tidygraph)
dograph<-as_tbl_graph(DHP)
ggraph(dograph,layout="fr")+geom_edge_link()+geom_node_label(mapping = aes(label=label))
ggraph(dograph,layout="fr")+geom_edge_link()+geom_node_label(mapping = aes(label=name))

# Show arrows
ggraph(dograph,layout="fr")+geom_edge_link(end_cap = square(.5, 'cm'),arrow = arrow(angle=10,length=unit(.2,"cm")))+geom_node_label(mapping = aes(label=label))

# A digram.object with a testlet
dograph<-as_tbl_graph(code.testlet(DHP,"a b c"))
ggraph(dograph,layout="fr")+geom_edge_link(end_cap = square(.5, 'cm'),arrow = arrow(angle=10,length=unit(.2,"cm")))+geom_node_label(mapping = aes(label=label))

# Local dependecy and DIF
dograph<-as_tbl_graph(DHP,LD=data.frame(item1=c(5,3),item2=c(6,5),gamma=c(.53,-.38)),DIF=data.frame(item=c(4),exo=c(8),gamma=c(.27)))
ggraph(dograph,layout="fr")+geom_edge_link(mapping=aes(label=ifelse(!is.na(gamma),abs(gamma),""),alpha=ifelse(!is.na(gamma),gamma,1),color=ifelse(!is.na(gamma),2,1)),angle_calc="along",label_dodge=unit(.25,"cm"),end_cap = square(.5, 'cm'),arrow = arrow(angle=10,length=unit(.2,"cm")))+geom_node_label(mapping = aes(label=label))

jeppebundsgaard/RDigram documentation built on Oct. 29, 2023, 7:15 p.m.