[Rasch] Separability of parameters

Looveer, Juho Juho.Looveer at det.nsw.edu.au
Thu Sep 28 09:43:22 EST 2006

Courier is a useful font, as all characters take up the same amount of
space  (i.e.  A dot or point is just as wide on the page as a dash or an
This means that pages set in Courier will have the same alignment and
patterns, whatever size you go to.

Hence Courier is the most useful font when using text to design graphs.

E.g.  Try changing the size of the two examples below

Courier font:
. . . . . . . . . 
   *   *   
. . . . . . . . . 

Arial font
. . . . . . . . . 
   *   *   
. . . . . . . . . 



Dr Juho Looveer 
Manager, Data Collection
Planning and Innovation 
NSW Department of Education and Training 
Level 5, 35 Bridge St Sydney 
GPO Box 33 
Sydney NSW 2001 
work phone: 956 18192 
fax: 956 18055 
Juho.Looveer at det.nsw.edu.au 

-----Original Message-----
From: rasch-bounces at acer.edu.au [mailto:rasch-bounces at acer.edu.au] On
Behalf Of Michael Lamport Commons
Sent: Thursday, 28 September 2006 4:20 AM
To: rasch at acer.edu.au
Subject: Re: [Rasch] Separability of parameters

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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