[Rasch] Validation & Rasch

commons commons at tiac.net
Fri Nov 23 06:43:36 EST 2007

Check to make sure that one is not varying more than one source of
difficulty.  Rasch will scale difficulty as if it is a single dimension even
though it is composed of many dimensions.  We have lots of example if you
would like to see them.
My best,

Michael Lamport Commons, Ph.D.
Assistant Clinical Professor
Department of Psychiatry
Harvard Medical School
Beth Israel Deaconess Medical Center
234 Huron Avenue
Cambridge, MA 02138-1328
commons at tiac.net
617-497-5270 Telephone
617-320-0896  Cellular
617-491-5270  Facsimile


From: rasch-bounces at acer.edu.au [mailto:rasch-bounces at acer.edu.au] On Behalf
Of Anthony James
Sent: Thursday, November 22, 2007 11:37 AM
To: rasch at acer.edu.au
Subject: Re: [Rasch] Validation & Rasch

Looking over papers which have used Rasch methodology to validate tests, I
found out a number of procedures for validating
1. Studying fit stats.
2. Checking threshold ordering
3. Assessing unidimensionality using PCA of residuals
4. Investigating DIF
5. Checking person measure invariance over subsets of the test
Have I left anything out?
Is there anything else that can be done?

Anthony James <luckyantonio2003 at yahoo.com> wrote:

Hi there,
Does anyone know of any articles where the Rasch model is used for valdating
a newly developed test?
I'd be grateful for the electronic version of the paper if possible.
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