R help - Jan 2007 - 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

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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