[Rasch] A practical one

Trevor Bond trevor.bond at jcu.edu.au
Mon Oct 10 13:44:38 EST 2005

Dear John

Perhaps we (or, I, at least) need some more information to understand 
your problem. Kids who repeated an exam (after doing make up work or 
just remembering) score better on a test the second time round. They 
scored more correct responses at T2 than at T1. This seems to be 
exactly what I would expect . . .or hope for . . .as an educator. 
Clearly I have missed the nature of your 'problem'.

At 1:32 PM +1000 10/10/05, John Barnard (EPEC) wrote:
>Dear all
>I would appreciate some opinions on the following scenario.
>The same paper was given on two occasions. Some 20% of students (let's
>call them the repeaters) who sat the first round (and failed) also sat
>the second round. In round 1, the repeaters' mean ability is (say) 0.5
>logits less than the non-repeaters'. After anchoring the item
>difficulties in the first round and using them in round 2 resulted in
>the repeaters now doing significantly better (say 0.7 logits on
>average). Also the repeaters now have approx the same mean ability as
>the non-repeaters in round 2, say 0.8 logits.
>The question is this: If the repeaters' mean ability increased by 0.7
>logits, how can one account for this (taking the same paper again) to
>not unfairly advantage the repeat group in round 2? (I am aware of
>learning and other factors, but let's ignore that for the moment.)
>John J Barnard
>Executive Director: EPEC Pty Ltd
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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
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New Territories HONG KONG

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