[Rasch] Fitting the RM

Trevor Bond trevor.bond at jcu.edu.au
Tue Jul 8 04:39:16 EST 2008

Of course Anthony,
Your observation is correct. Given that we 'analyse data using the 
Rasch model', I would never use 'the test was fitted to the Rasch 
model'. (I hope!)

We can often use terms inappropriately - e.g., accuracy and 
precision, but that does not excuse us. We should always try to use 
terms accurately where possible - esp. where particular usage is 
important and distinctive.

At 8:30 AM -0700 7/7/08, Anthony James wrote:
>Thomas and Trevor,
>Thanks for your replies.
>I can followe your argumentation.
>however, the expressions I mentioned are very common even among 
>Rasch practitioners.
>when one says "the Rasch model was fitted to test X", this cannot 
>imply manipulation of the model to fit the data. because there is 
>only one RM (irrespective of its family of models) and the 
>researchers hasn't shifted to another model to account for the data 
>at hand. my questions is a questions of Rasch measuremnt wording and 
>how about if we say "test X was fitted to the RM"?

Trevor G BOND Ph D
Professor and Head of Dept
Educational Psychology, Counselling & Learning Needs
D2-2F-01A EPCL Dept.
Hong Kong Institute of Education
10 Lo Ping Rd, Tai Po
New Territories HONG KONG
Voice: (852) 2948 8473
Fax:  (852) 2948 7983
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