Date:         Sun, 21 Aug 2011 07:05:07 -0600
Reply-To:     Jon K Peck <peck@us.ibm.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Jon K Peck <peck@us.ibm.com>
Subject:      Re: Rasch Model
Comments: To: bgreen <bgreen@dyson.brisnet.org.au>
In-Reply-To:  <1313922889235-4720173.post@n5.nabble.com>
Content-Type: multipart/alternative;

There are three Rasch model related extension commands available from the
SPSS Community website (www.ibm.com/developerworks/spssdevcentral).  You
can find these in the Statistics collection on that site.  All of these
have  both a dialog box interface and standard SPSS Statistics syntax.

STATS GRM
Description: Estimate three-parameter item response model
Version: 1.0.0, Minimum Statistics Version: 17.0.0, Author: AR, IBM SPSS
This package fits the Graded Response model for ordinal polytomous data
via an IRT approach. It requires the R plugin. Installation instructions
are in the readme file.

STATS IRM
Description: Estimate three-parameter item response model
Version: 1.0.0, Minimum Statistics Version: 17.0.0, Author: AR, IBM SPSS
The STATS IRM command fits three-parameter item response models using the
tpm function from the R ltm package. It is assumed that the values of the
item variables is 0,1. By default, the procedure produces estimates of the
model coefficients, and you can request optional output such as the item
fit statistics, plots of the factor scores, and item characteristic
curves, and save person-fit statistics to a new dataset.

SPSSINC RASH
R Extension Command for Rasch Models
Version: 1.1.0, Minimum Statistics Version: 17.0.0, Author: AR, IBM SPSS
As of Statistics Version 19, this package is included in the R Essentials.

This package provides a procedure and a dialog box interface for
estimation of Rasch models.
It requires the R plug-ins and the R rasch package.

Jon Peck (no "h")
Senior Software Engineer, IBM
peck@us.ibm.com
new phone: 720-342-5621




From:   bgreen <bgreen@dyson.brisnet.org.au>
To:     SPSSX-L@LISTSERV.UGA.EDU
Date:   08/21/2011 04:37 AM
Subject:        Re: [SPSSX-L] Rasch Model
Sent by:        "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>



John,

I checked the version 19 at work and did not see a Rasch option in
Analyze>Scale menu. Is there an additional SPSS module required.

Is it possible to obtain the test dataset and output that you referred to
in
this earlier e-mail.

Any assistance is appreciated,

Bob.

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