Date:         Mon, 21 Mar 2011 08:38:30 -0400
Reply-To:     "Daniel J. Robertson" <drobertson@cornell.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         "Daniel J. Robertson" <drobertson@cornell.edu>
Subject:      Re: Rasch Model in SPSS
Comments: To: Eins Bernardo <einsbernardo@yahoo.com.ph>
In-Reply-To:  <725822.48165.qm@web78002.mail.sg1.yahoo.com>
Content-Type: multipart/alternative;

It looks like you're seeing the difficulty indices and standard errors for nine items, along with a single unconstrained discrimination parameter. The Rasch extension itself uses the R package 'ltm,' which you can find documentation for at http://cran.r-project.org/web/packages/ltm/index.html or http://www.jstatsoft.org/v17/i05. You can also get syntax help by running the command "SPSSINC RASCH /HELP."

--
Daniel Robertson
Senior Research and Planning Associate
Institutional Research and Planning
Cornell University / irp.cornell.edu

From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of Eins Bernardo
Sent: Sunday, March 20, 2011 9:31 AM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: [SPSSX-L] Rasch Model in SPSS

I tried to run the Rasch Model for the 10 items using R in SPSS.  I was dismayed of the outputs as presented below.  Please comment if I need something to download from the R website and then install to my computer.

Thank you.
Eins

Coefficients


value

std.err

z.vals

Dffclt.base

-1.793

.224

-8.016

Dffclt.prstt

-2.181

.253

-8.611

Dffclt.advst

-1.435

.200

-7.163

Dffclt.ts

-.306

.157

-1.943

Dffclt.prsnt

-1.368

.196

-6.966

Dffclt.permp

-.955

.176

-5.432

Dffclt.chaid

-1.034

.179

-5.769

Dffclt.map

-.324

.158

-2.053

Dffclt.nernt

.173

.156

1.104

Dscrmn

.846

.074

11.484





[text/html]