Wald tests of differential item functioning (DIF).

A Wald test of DIF on each item. Called internally by rdif

Usage

dif_test(object, theta = NULL, fun = "d_fun3")

Arguments

object

either the output of get_model_parms or an rdif object from rdif.

theta

the estimated scaling parameter from rdif

fun

one of c("a_fun1", "a_fun2", "d_fun1", "d_fun2", "d_fun3"). See description for details.

Value

A data.frame whose rows containing the results of the test for each item parameter.

Examples

# \donttest{
mod <- rdif(mle = rdif.eg)
#> Error: object 'rdif.eg' not found
dif_test(object = rdif.eg, theta = mod$est)
#> Error: object 'rdif.eg' not found
dif_test(mod)
#> Error: object 'mod' not found
# }