[R] differential item function for item response theory

SHEN,FENG fshen at ufl.edu
Tue Jan 9 22:09:02 CET 2007

Hi my friends,

I'm very new to R and need your help.

I used R and ltm package for item response theory (IRT) modeling.  
I also need to compute differential item function (DIF) for IRT 
models.  I searched the archive but basically found nothing.  
Could you help me find some sources about handling DIF of IRT?

Many thanks in advance!


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