[R] differential item function for item response theory

Doran, Harold HDoran at air.org
Tue Jan 9 22:15:36 CET 2007

I don't know of any functions specifically designed to handle DIF (e.g.,
mantel-hantzel). But, ltm does give you the point estimates and standard
errors so you can do a t-test between the focal and reference groups.

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of SHEN,FENG
> Sent: Tuesday, January 09, 2007 4:09 PM
> To: r-help at 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 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!
> Feng
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