[Rasch] Fitting the RM
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
>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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