[Rasch] Empirical order & Theoretical order

Anthony James luckyantonio2003 at yahoo.com
Sun Oct 31 22:44:25 EST 2010

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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