I think I could help you figure out what is going on here but would
need to see both the PROC MIXED code and xtmixed code you used. So if
you could post that information, I can give you some more help.
Best,
Scott
On Fri, Dec 11, 2009 at 7:13 AM, Lucas Goossens <[email protected]> wrote:
> I also tried to reproduce results from SAS proc mixed in Stata.
> Your discussion was very helpful to me, but there is still something that I
> do not understand.
> I got the same coefficients, standard errors covariances for all variables,
> but the variances as well as the constant in SAS were different from those
> in Stata.
> Could anyone explain this?
>
> --
> Lucas Goossens, MSc
> institute for Medical Technology Assessment (iMTA)
> institute for Health Policy and Management (iBMG)
> Health Economics and Health Technology Assessment section
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