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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 > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/