DIF analysis - requires having set up dif.variables previously

Makes use of the psychotree package, which also allows for interactions between DIF variables, see RIdifTable2().

Usage

RIdifTable(dfin, dif.var, cutoff = 0.5)

Arguments

dfin

Dataframe with item data only

dif.var

DIF variable

cutoff

Cutoff in item location logit difference for table highlighting

Details

DIF variables need to be vectors with the same length as the number of rows in the dataset.

sample usage: RIdifTable(df, dif.age)