[Rasch] Validity in Rasch

Mike Linacre rmt at rasch.org
Mon Mar 21 17:34:29 EST 2011


Thank you for your question, Juanito.

For some of the basic Rasch-model assumptions, please see Dr. Reinhold 
Hatzinger's PDF, page 10.
http://statmath.wu-wien.ac.at/people/hatz/psychometrics/10w/RM_handouts_2.pdf

Since each assumption can be violated in numerous ways, there are many 
different tests of those assumptions. The numerous fit tests in Winsteps 
are parameter-level tests of the assumptions.

If you are interested in rigorous global tests of Rasch assumptions, then 
CMLE-based software is more suitable than Winsteps. For CMLE software, 
please see www.rasch.org/software.htm . Many explicit tests of the 
assumptions are described in Fischer and Molenaar's book, "Rasch Models: 
Foundations, Recent Developments and Applications".

OK?

Mike L.

At 3/20/2011, you wrote:
>Can you suggest a reference that deals with the assumptions of Rasch 
>Model?.  How to test the assumptions using Winsteps?

Mike Linacre
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT:  24:4 Spring 2011
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