[R] differential item function for item response theory

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

Re: [R] differential item function for item response theory

] On Behalf Of SHEN,FENG Sent: Tuesday, January 09, 2007 4:09 PM To: r-help@stat.math.ethz.ch Subject: [R] differential item function for item response theory 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