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Re: st: Rasch model INFIT


From   Laura Gibbons <gibbonsl@u.washington.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Rasch model INFIT
Date   Mon, 26 Mar 2012 09:51:31 -0700 (PDT)

Raschtest is a user-written program (you are asked to specify this), so if you don't get help here, you'll need to contact the author, whose contact information is in the help file.

On Fri, 23 Mar 2012, Pritchard, Alison wrote:

Hello listserv members,

I am attempting to apply the Rasch model in an evaluation of intra-subtest scatter on several subtests of a common IQ measure.  I am interested in the extent to which inattention is related to an inconsistent response pattern across items within a subtest.  In order to test my hypotheses, I would like to evaluate participants' Rasch person fit indices in relation to their scores on measures of inattention.  Specifically, I am interested in the INFIT index which is available via the "raschtest" command.  My problem is that when I run the model, all participants' INFIT values come up as zero.  Any help with this would be greatly appreciated.

Thanks very much,

Alison E. Pritchard, Ph.D.
Director, Neuropsychology Research Lab
Kennedy Krieger Institute
Faculty Instructor, Department of Psychiatry & Behavioral Sciences
Johns Hopkins School of Medicine
Phone: (443)923-4409





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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Laura E. Gibbons, PhD
General Internal Medicine, University of Washington
Box 359780, Harborview Medical Center, 325 Ninth Ave, Seattle, WA 98104
phone: 206-744-1842, fax: 206-744-9917,
Office address: 401 Broadway, Suite 5122.7
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