[Rasch] Separability of parameters

Michael Lamport Commons commons at tiac.net
Thu Sep 28 04:20:26 EST 2006

How does one make nice looking maps from Winsteps?  Some reviewer complained 
of the ones done in Winsteps in courier.

My Best,

Michael Lamport Commons, Ph.D.
Assistant Clinical Professor
Program in Psychiatry and the Law
Department of Psychiatry
Harvard Medical School
Beth Israel Deaconess Medical Center
234 Huron Avenue
Cambridge, MA 02138-1328

Telephone (617) 497-5270
Facsimile (617) 491-5270
Commons at tiac.net

----- Original Message ----- 
From: "Snider-Lotz, Tom" <tsnider-lotz at previsor.com>
To: <rasch at acer.edu.au>
Sent: Wednesday, September 27, 2006 12:39 PM
Subject: [Rasch] Separability of parameters

Hello everybody -

I recently read a manuscript that said the Rasch model was the only one
that featured separability of parameters.  One inference I make from
that statement is that, for 2PL and 3PL models, the IRT item parameters
are somewhat dependent of the sample on which they are developed.  Is
that correct, or do I misunderstand this (as I often do).

Thanks, all.

 -- Tom Snider-Lotz


Thomas G. Snider-Lotz, Ph.D.
Principal Scientist
1805 Old Alabama Road, Suite 150
Roswell, GA 30076
T:678.832.0555 F:770.642.6115
tsnider-lotz at previsor.com
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