[Rasch] A way to back out the item parameters?

Bond, Trevor trevor.bond at jcu.edu.au
Mon Feb 27 07:14:19 AEDT 2017


Dear Stuart,
Given that the logic of the analysis is the same for items as for persons, I would run the analysis by importing the PFile.
Regards
T

Prof Trevor G BOND

> On 27 Feb 2017, at 3:26 am, Stuart Luppescu <lupp at uchicago.edu> wrote:
> 
> Fellow Raschies, I have a dataset of dichotomous item responses and
> Rasch person measures produced from anchored item difficulties. The
> item difficulties are proprietary information, but I need the anchor
> values to do an analysis of item parameter drift. (I'm not going to
> steal the instrument and repackage it and sell it, or anything like
> that.) Is there a way to recover the item difficulties given the
> responses and the person measures?
> 
> TIA.
> -- 
> Stuart Luppescu
> Chief Psychometrician (ret.)
> UChicago Consortium on School Research
> http://consortium.uchicago.edu
> 
> lupp at uchicago.edu
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