Achim.Zeileis at uibk.ac.at
Tue Dec 9 22:36:39 CET 2014
On Tue, 9 Dec 2014, Richard M. Heiberger wrote:
> I recommend the likert() function in the HH package.
I think this only visualizes the polytomous items but provides no formal
inference for IRT modeling and DIF testing.
For fitting polytomous IRT models (PCM, RSM, etc.) there are various R
packages available, probably most prominently the "eRm" package. This also
includes several tests for DIF. But many other approaches are also
available (including the "lordif" package). A good first overview is given
in the Psychometrics task view on CRAN, see:
> On Tue, Dec 9, 2014 at 3:22 AM, munevver kaya <munevver.rock at gmail.com> wrote:
>> I will analyze polytomous differential item functioning for IRT. I have a
>> Likert type scale. For example, I want to analyze items in term of gender.
>> Is lordifsufficient for this or are there any other packages in R
>> Best Regards,
>> [[alternative HTML version deleted]]
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
More information about the R-help