Hi,
I have just installed and used spss 29. I was using spss 27.
I am analyzing data with a crossed random effects mixed model.
I am using syntax for this type of analysis. With the exact same syntax and data base I obtain different results with spss 29 and spss 27!
Specifically, the same model (that I call model 3) run with spss 27 was not giving me a warning whereas with spss 29 I get a warning (The final Hessian matrix is not positive definite although all convergence criteria are satisfied. The MIXED procedure continues despite this warning. Validity of subsequent results cannot be ascertained.).
Another case: with a slightly simpler model that I call model 2, I have no warnings but the results with spss 27 and spss 29 are not identical (e.g. BIC is different).
Is anyone experiencing the same or similar ?
Hello Patrick Gomez. I think that you will have better luck getting an answer to this question if you post to a forum dedicated to SPSS. The most active such forum I know of these days is SPSSX-L. It is really an old-school mailing list that is administered by the University of Georgia. You can find it here:
- https://listserv.uga.edu
If you post your question there, I advise you to also post the command syntax.
I hope this helps.
According to IBM, running a new syntax command in an older version of SPSS could fail-
Source- https://www.ibm.com/support/pages/are-spss-statistics-files-compatible-between-different-versions
This could be why you might be experiencing the difference in the results.
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