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compare.margins

Compares two marginal effects (MEMs or AMEs). Estimate of uncertainty is from a simulated draw from a normal distribution.

For example:

library(catregs)
data("essUK")
m1 <- glm(safe ~ religious + minority*female + age,data=essUK,family="binomial")
des<-margins.des(m1,expand.grid(minority=c(0,1),female=c(0,1)))
des

##   minority female religious      age
## 1        0      0  3.602404 53.14563
## 2        1      0  3.602404 53.14563
## 3        0      1  3.602404 53.14563
## 4        1      1  3.602404 53.14563

ma1 <- suppressWarnings(as.data.frame(marginaleffects::avg_slopes(m1,
                                                                         variables="female",newdata=marginaleffects::datagrid(minority=0,
                                                                                                                              religious=3.6024,age=53.146))))
ma2 <- suppressWarnings(as.data.frame(marginaleffects::avg_slopes(m1,
                                                                  variables="female",newdata=marginaleffects::datagrid(minority=1,
                                                                                                                       religious=3.6024,age=53.146))))
cames <- rbind(ma2,ma1)
compare.margins(margins=cames$estimate,margins.ses=cames$std.error)

##   Difference p-value
## 1  0.1447181  0.0199

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