[Rasch] Empirical order & Theoretical order
connert at msu.edu
Mon Nov 1 01:27:30 EST 2010
I would do a couple of things. I would do a critical analysis of the
theory behind the theoretical ordering and how well the items represent
that ordering. Your theory may need revision. Second, but probably
more important, I would interview test takers. It is quite possible
that they understand the items differently than you, or see other
information that you did not see. I would guess that some easier items
turn out to be more difficult than theoretically specified rather than
Anthony James wrote:
> Dear colleagues,
> If the empirical difficulty order of items does not corresponde with the theoretical difficulty in terms of coginitive demand of the items, what can we conclude about the test?
> Does this invalidate the additivity of the scores, even if we have perfect fit?
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