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Re: st: SE erroes for xtmixed-predict fitted


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: SE erroes for xtmixed-predict fitted
Date   Tue, 28 Feb 2012 16:46:16 -0800 (PST)

Thank you Steve.

I did see Steve's post, however when I tried doing this, I got the same SE for every patient when I leave out the random slope term i.e.:

xtmixed cholest i.drug month || patid

So I was not sure that it was working correctly. When I included the random slope term, I get slightly different values for each patient but still very similar to each other. Is that what I should expect?

Ricardo

Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


--- On Tue, 2/28/12, Steve Samuels <sjsamuels@gmail.com> wrote:

> From: Steve Samuels <sjsamuels@gmail.com>
> Subject: Re: st: SE erroes for xtmixed-predict fitted
> To: statalist@hsphsun2.harvard.edu
> Cc: rgutierrez@stata.com
> Date: Tuesday, February 28, 2012, 4:37 PM
> You must have missed http://www.stata.com/statalist/archive/2011-12/msg00852.html
> 
> where I tried to answer a related questionn. I'm not sure
> I'm right. If I'm not, I bet that Bobby Gutierrez knows.
> 
> Steve
> sjsamuels@gmail.com
> 
> On Feb 28, 2012, at 3:50 PM, Ricardo Ovaldia wrote:
> 
> I searched the Statalist archives for the answer to the
> following query and could not find one. Can someone please
> help.
> 
> 
> After using -xtmixed- to fit:
> 
> xtmixed cholest i.drug month || patid:month
> 
> I used -predict, fitted- to get predicted estimates that
> account for both the fixed and random effects. 
> I them average these over drug and month to get mean
> predicted cholesterol values for each drug at each time
> point. 
> Is there a way to place a CI or to calculate SE for these
> estimates?
> 
> Thank you,
> Ricardo.
> 
> 
> 
> Ricardo Ovaldia, MS
> Statistician 
> Oklahoma City, OK
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