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Re: st: stata and spss output


From   "Stephen P. Jenkins" <stephenj@essex.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: stata and spss output
Date   Mon, 31 Mar 2003 09:24:55 +0100 (GMT Daylight Time)

On Mon, 31 Mar 2003 07:58:12 +0100 ann e fitzmaurice 
<a.e.fitzmaurice@abdn.ac.uk> wrote:

> hi
> I am using spss and stata
> I have experienced a problem with weighted analysis - the weights have been 
> set in spss and stata
> I run either a crosstab in spss and include the line in the syntax (spss) 
> count=asis ,or svytab in stata, this will produce identical tables and 
> identical column percentages
> 
> The problem that I have is that the test statistic are different, I can 
> obtain a Pearson chi-square in spss, and also a p value based on the log 
> likelihood, but when I ask stata to produce the same I get a slightly 
> different value and different p value
> 
> Can anyone explain what is happening and if I should be using the log 
> likelihood values instead of Pearson in spss

A colleague has reported a similar problem to me, based a different 
SPSS, Stata comparison, but also using weighted data. Sorry, I can't 
remember the details, but I recall that the core of the problem was 
the "sample size" that was used to calculate the test statistics. From 
memory, SPSS was doing things incorrectly; it was using the weighted 
sample size, rather than actual number of obs.  (Stata got things 
right.)

Stephen
----------------------
Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
Institute for Social and Economic Research (ISER)
University of Essex, Colchester, CO4 3SQ, UK
Tel: +44 (0)1206 873374. Fax: +44 (0)1206 873151.
http://www.iser.essex.ac.uk

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