[Rasch] Rasch & validity

Anthony James luckyantonio2003 at yahoo.com
Wed Jan 26 21:37:43 EST 2011


Dear all,
Validity is defined as "the degree to which a test measures what it is supposed to measure". 
How can fit to the Rasch model be evidence of validity?
Can't we have a say, anxiety scale that perefctly fits the Rasch model but does not actually measure anxiety? 
How does Rasch analysis guarantee that a test actually test what it should test?

Cheers
Anthony 


      



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