The integration method has changed. From -help whatsnew8to9- :
" 2. New features have been added to the maximum-likelihood estimators
that do not have closed-form solutions and require numeric evaluation of the
likelihood. These estimators include xtlogit, xtprobit, xtpoisson,
xtcloglog, xtintreg, and xttobit.
a. The likelihood may now be approximated using adaptive
Gauss-Hermite quadrature (the new default) or nonadaptive quadrature (the
previous default). Adaptive quadrature substantially increases the accuracy
of the approximation, particularly on difficult problems such as data with
large panel sizes or data with a large variance for the random effects."
Scott
> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Silvia Mendolia
> Sent: Tuesday, November 07, 2006 5:49 PM
> To: [email protected]
> Subject: st: Stata 8 and 9
>
> Hello everybody,
>
> I know this seems a very silly question....
>
> I am running the same regression (xtprobit) on the same sample on 2
> different computers. One has Stata 8 and the other has Stata 9.
> Is it possible to have slightly different results?
>
> I thought it was impossible, but I can't find any other explanation...
> The coefficient are differebt from the 3rd dec digit, but anyway...
>
> Any ideas?
>
> Thank you,
>
> Silvia
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