[Rasch] Negative pt-bis and fit of 1.0? How can this be?

Bond, Trevor trevor.bond at jcu.edu.au
Wed Mar 7 10:42:08 EST 2012

Nicely done:

So, what fit statistics are able to tell you depends entirely upon how much you already know about the relevant, psychological system. Completely relying upon them as evidence of the behaviour of a single, relevant psychological quantity is far too much to ask of them.
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