Find quantities of interest from generalized linear models
Description
Find quantities of interest from generalized linear models
Usage
1 2  qi_builder(obj, newdata, FUN, ci = 0.95, nsim = 1000, slim = FALSE,
b_sims, large_computation = FALSE, original_order = FALSE, ...)

Arguments
obj 
a fitted model object from which to base coefficient simulations on. 
newdata 
an optional data frame of fitted values with column names
corresponding to variable names in 
FUN 
a function for calculating how to find the quantity of interest
from a vector of the fitted linear systematic component. It must return
a numeric vector. If 
ci 
the proportion of the central interval of the simulations to return. Must be in (0, 1] or equivalently (0, 100]. 
nsim 
number of simulations to draw. 
slim 
logical indicating whether to (if 
b_sims 
an optional data frame created by 
large_computation 
logical. If 
original_order 
logical whether or not to keep the original scenario
order when 
... 
arguments to pass to

Value
If slimmer = FALSE
a data frame of fitted values supplied in
newdata
and associated simulated quantities of interest for all
simulations in the central interval specified by ci
. The quantities
of interest are in a column named qi_
.
If slimmer = TRUE
a data frame of fitted values supplied in
newdata
and the minimum, median, and maximum values of the central
interval specified by ci
for each scenario are returned in three
columns named qi_min
, qi_median
, and qi_max
,
respectively.
Examples
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34  library(car)
## Normal linear model
m1 < lm(prestige ~ education + type, data = Prestige)
# Using observed data as scenarios
linear_qi_obs < qi_builder(m1)
# Create fitted values
fitted_df_1 < expand.grid(education = 6:16, typewc = 1)
linear_qi < qi_builder(m1, newdata = fitted_df_1)
## Logistic regression
# Download data
URL < 'http://www.ats.ucla.edu/stat/data/binary.csv'
Admission < read.csv(URL)
Admission$rank < as.factor(Admission$rank)
# Estimate model
m2 < glm(admit ~ gre + gpa + rank, data = Admission, family = 'binomial')
# Specify fitted values
m2_fitted < expand.grid(gre = seq(220, 800, by = 10), gpa = c(2, 4),
rank = '4')
# Function to find predicted probabilities from logistic regression models
pr_function < function(x) 1 / (1 + exp(x))
# Find quantity of interest
logistic_qi_1 < qi_builder(m2, m2_fitted, FUN = pr_function)
logistic_qi_2 < qi_builder(m2, m2_fitted, FUN = pr_function,
slim = TRUE)

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