st: mvprobit and changing results

["U.G. Narloch" <ugn20@cam.ac.uk>]

Dear Statalist Users,

I use two do-files: the first one for generating the dataset from different 
dta-files and the second one for running the data analysis focusing on a 
mv-probit model drawing on the dataset generated from the first do-file.

I have just realised that every time I replace the previous dataset.file by 
simply rerunning the first do-file the mv-probit results for exactly the 
same model specifiaction change. Coefficients and standard errors vary 
slightly, but the output for the correlation coefficients between error 
terms change significantly (sometimes even from negative to positive 
significance).

As the output for other estimation commands (reg, probit, etc.) does not 
change I guess that this is due to the mvprobit. But I do not understand 
what could be the reason for this.

Is there anyone having an idea what is going on?

I am grateful for any comments!

Thanks,
Ulf Narloch




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