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RE: st: Xtmixed from SAS to Stata


From   "Di Stefano, Paola" <[email protected]>
To   <[email protected]>
Subject   RE: st: Xtmixed from SAS to Stata
Date   Tue, 30 Jan 2007 15:26:41 +0100

Perfect!
The results it's correct....even if Stata gives me a Z test while I need F test.
Anyway thanks a lot
Paola
 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Joseph Coveney
Sent: marted� 30 gennaio 2007 14.45
To: Statalist
Subject: Re: st: Xtmixed from SAS to Stata

Paola Di Stefano wrote:

I need to translate this procedure from SAS to Stata:

proc mixed;
class numero;
model bnp=dte / noint s;
repeated / subject=numero r;
run;

--------------------------------------------------------------------------------

Here's a stab at it:

xtmixed bnp dte, noconstant || numero:

dte's absence from the CLASS statement indicates that it's continuous.  (It seems odd not to want an intercept in such a model.)  I believe the default variance-covariance structure for the REPEATED statement is variance components, so dte won't appear in the random effects equation as a random slope.

Joseph Coveney

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