Re: st: Rasch model INFIT

[Laura Gibbons <gibbonsl@u.washington.edu>]

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
>
>
>
>
>
> Disclaimer:
> The materials in this e-mail are private and may contain Protected Health Information. Please note that e-mail is not necessarily confidential or secure. Your use of e-mail constitutes your acknowledgment of these confidentiality and security limitations. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying, distribution, or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender via telephone or return e-mail.
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/