[Rasch] Equating problem

iasonas lambrianou liasonas at lycos.com
Sat Jul 15 20:17:28 EST 2006

Dear friends, does anyone have information about countries or organisations that use items banks for public examinations?

any help will be appreciated


> ----- Original Message -----
> From: "Stuart Luppescu" <s-luppescu at uchicago.edu>
> To: "Rasch List" <rasch at acer.edu.au>
> Subject: [Rasch] Equating problem
> Date: Tue, 27 Jun 2006 16:26:30 -0500
> Hi all, I have a tricky equating problem. I'm trying to equate two tests
> using common people. However, one test was given under very high-stakes
> conditions, and the other was given under NO stakes. Furthermore, the
> no-stakes test was always given second. (The district authorities didn't
> want anything interfering with or influencing results on the high-stakes
> test.)
> I did an equipercentile equating of the two tests, and found uniformly
> lower performance on the no-stakes test. The results of the Rasch
> equating showed similar performance by students on both tests. In two
> grades on the math test, students did a bit better on the low-stakes
> test (differences of .14 and .08 logits); in two grades on the reading
> test, students did a bit better on the high-stakes test (differences
> of .11 logits).
> The question is, is there any way I can disentangle the effects of
> differential effort due to differencens in stakes, from actual
> differences in the tests?
> Thanks.
> --
> Stuart Luppescu -=-=- s-luppescu <AT> uchicago <DOT> edu
> CCSR at U of C ,.;-*^*-;.,  www.consortium-chicago.org
>       (^_^)/    才文と智奈美の父
> Thank God I'm an atheist!
> << smime.p7s >>
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Dr. Iasonas Lamprianou
CFAS, School of Education
The University of Manchester
Oxford Road, Manchester M13 9PL, UK
Tel. 0044  161 275 3485
iasonas.lamprianou at man.ac.uk


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