[Rasch] Rasch and Missing data

Agustin Tristan ici_kalt at yahoo.com
Sun Jul 6 02:33:48 EST 2008

Hello Trevor,
Following the examples by Thomas, with two persons, Peter and Joe, having 3 correct in a 30 items test, with no missing data. Peter answers correctly the 3 more easy items, while Joe has correct the 3 more difficult. They have 27 wrong answers, no missing. 
Probably Peter meets the Rasch requirements for fit but Joe certainly doesn't. In any case we have to provide the measure to both students. How can we explain Joe that we cannot provide any measure or score because his answers don´t meet the Rasch requirement for fit? Give me an idea please.

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--- On Fri, 7/4/08, Trevor Bond <trevor.bond at jcu.edu.au> wrote:

From: Trevor Bond <trevor.bond at jcu.edu.au>
Subject: Re: [Rasch] Rasch and Missing data
To: ici_kalt at yahoo.com, "Thomas Salzberger" <Thomas.Salzberger at wu-wien.ac.at>, "-Rasch" <rasch at acer.edu.au>
Date: Friday, July 4, 2008, 8:21 PM

We should always remember that N is the sufficient statistic ONLY to 
the extent that the data meets the Rasch requirements for fit.
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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