[R] differential item function for item response theory
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!
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> and provide commented, minimal, self-contained, reproducible code.
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