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st: stata and spss output


From   ann e fitzmaurice <a.e.fitzmaurice@abdn.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: stata and spss output
Date   Mon, 31 Mar 2003 07:58:12 +0100

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

The syntax for spps is below- I have previously set the weighting variable
CROSSTABS
/TABLES=wltind5a BY sib_grp
/FORMAT= aVALUE TABLES
/STATISTIC=all
/Count = asis
/CELLS= COUNT COLUMN.

The command for stata after using svyset to set the weights
svytab wltind5a sib_grp if filter__==1,count col pearson

The results from spss using Pearson give a pvalue of 0.032 and the log likelihood p value of 0.044
The results from stata (which bases the result on a f distribution) gives a pvalue of 0.045

Any comments would be appreciated
regards
ann

------------
ann e fitzmaurice
a.e.fitzmaurice@abdn.ac.uk

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