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Re: st: RE: power analysis for mixed models


From   MAY BAYDOUN <mbaydoun2002@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: power analysis for mixed models
Date   Thu, 15 May 2008 09:58:28 -0700 (PDT)

Thank you so much! That is very helpful.

May
--- Steven Samuels <sjhsamuels@earthlink.net> wrote:

> The website for OD ("Optimal Design") is:
> http://sitemaker.umich.edu/ 
> group-based/optimal_design_software
> 
> -Steve
> On May 15, 2008, at 11:41 AM, Lachenbruch, Peter
> wrote:
> 
> > There is a program OD - it's available through U
> Michigan Survey
> > Research Center.  The authors are Jessica Spybrook
>  
> > (jessacah@umich.edu),
> > Andres Martinez (amzzz@umich.edu) , Xiaofeng Liu
> (xliu@gwm.sc.edu )  
> > and
> > Stephen Raudenbush (sraudenb@uchicago.edu ).
> > It's based on work by Raudenbush and colleagues. 
> It's pretty easy to
> > use, but you need to figure out what the 'right'
> values of some
> > parameters are.
> >
> >
> > Tony
> >
> > Peter A. Lachenbruch
> > Department of Public Health
> > Oregon State University
> > Corvallis, OR 97330
> > Phone: 541-737-3832
> > FAX: 541-737-4001
> >
> >
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu
> > [mailto:owner-statalist@hsphsun2.harvard.edu] On
> Behalf Of MAY BAYDOUN
> > Sent: Thursday, May 15, 2008 8:31 AM
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: power analysis for mixed models
> >
> > Hello,
> >
> > I was wondering if there is an easy way to
> calculate
> > power for mixed models in Stata using a similar
> method
> > as the one for stpower. I know there is a command
> for
> > repeated measures but not for xtmixed or xtreg.
> Thank
> > you,
> >
> > May
> >
> > May Baydoun, PhD in Epidemiology (UNC-Chapel Hill)
>  Staff Scientist,
> > National Institute on Aging, NIH/IRP,  Biomedical
> Research Center,
> > Baltimore, MD
> >
> >
> >
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May Baydoun, PhD in Epidemiology (UNC-Chapel Hill)  Staff Scientist,  National Institute on Aging, NIH/IRP,  Biomedical Research Center,  Baltimore, MD


      
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