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

Stuart Luppescu lupp at uchicago.edu
Mon Feb 27 04:26:07 AEDT 2017


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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