Thanks, Achim and Richard,
I will take into consideration your solutions.
Best,
On Tue, Dec 9, 2014 at 11:36 PM, Achim Zeileis <achim.zeil...@uibk.ac.at>
wrote:
> On Tue, 9 Dec 2014, Richard M. Heiberger wrote:
>
> I recommend the likert() function in the HH package.
>>
>> install.packages("HH")
>> library(HH)
>> ?likert
>>
>
> 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: http://CRAN.R-project.org/
> view=Psychometrics
>
> hth,
>
> Z
>
>
>>
>> On Tue, Dec 9, 2014 at 3:22 AM, munevver kaya <munevver.r...@gmail.com>
>> wrote:
>>
>>> Hello,
>>> 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
>>> programme?
>>> Best Regards,
>>>
>>> [[alternative HTML version deleted]]
>>>
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>>>
>>
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>> PLEASE do read the posting guide http://www.R-project.org/
>> posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
[[alternative HTML version deleted]]
______________________________________________
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