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Re: st: Raschtest


From   Jean-Benoit Hardouin <jean-benoit.hardouin@univ-nantes.fr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Raschtest
Date   Mon, 31 Aug 2009 14:57:25 +0200

This message is printed where many scores are not represented (for your 4 items, certainly you have few individuals with a score of 1 or 2 or 3 ). If the -autogroup- option don't "repair" this problem, I suppose that all the individuals of your sample have a positive or a negative response to all the five items (and so all the scores are 0 or 4). I think that none fit tests can be used in this case and that the fit can not be good (because this is a very deterministic framework to use the Rasch model).
I hope this helps !
Best
Jean-Benoit

Ousmane FAYE a écrit :
Dear all,
I am running the "Raschtest" command on four dichotomous variables
to analyze fit for an index variable. I used the following
command: "raschtest Q5_111 Q5_114 Q5_113 Q5_112, id(hhid)". However, I received the following error message: "(Files with residence episodes and individual characteristics) At least one group of scores concerns none individuals. Tests will be not computed. Use the group or the autogroup options."
I tried both options (group or autogroup) but I still receive the same error message. Is there any way to fix this and compute the tests I
need? Your help would be very much appreciated.
Thanks in advance,

Ousmane
Nairobi, Kenya


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--

Jean-Benoit Hardouin, PhD
Maitre de Conférences - Assistant Professor
EA 4275 "Biostatistics, Clinical Research and Subjective Measures in Health Sciences"
http://www.sante.univ-nantes.fr/biostat/

Departement of Biomathematics and Biostatistics
Faculty of Pharmaceutical Sciences
University of Nantes
1, rue Gaston Veil - BP 53508 44035 Nantes Cedex 1 - FRANCE Email : jean-benoit.hardouin@univ-nantes.fr Personal website : http://www.anaqol.org
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