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From | May Lebanan <mlebanan@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: Re: Repeated measures with covariates |
Date | Mon, 27 Aug 2012 14:49:11 +0800 |
Thank you Dr. Coveney. I will try the time-invariant covariate in the model. Another question, after running the anova command, we can use the anovaplot or margins then marginsplot. However, I am not getting the same values/graph similar to the means using the command 'table' (If i have 2 independent categorical variables only, no covariate). Is there a command that can do this, aside from resorting to the use of table command then doing the graphs in excel? On Sun, Aug 26, 2012 at 10:28 PM, Joseph Coveney <jcoveney@bigplanet.com> wrote: > May Lebanan wrote: > > Hi, I am doing an analysis on a dependent variable called RExp > measured on several follow-up times (Ffupno) and would like to compare > among 4 groups (grp) and sex and would like to include a covariate > Hemoglobin. Without the covariate my anova model looks like this: > > anova RExp grp sex sex#grp / Respcode|grp#sex Ffupno Ffupno#grp > Ffupno#sex Ffupno#grp#sex, repeated(Ffupno) > > Now I cannot find a reference on how to incorporate a covariate in this model. > What if I want to add several covariates, would that be possible and > what would the command look like? Please help. > > -------------------------------------------------------------------------------- > > How to incorporate your hemoglobin covariate into the repeated-measures ANCOVA > model depends upon whether hemoglobin concentration is measured at each > follow-up observation (a so-called time-varying covariate) or is measured only > once, for example, at baseline (a time-invariant covariate). See this thread > for specifics about how to do each: > http://www.stata.com/statalist/archive/2004-01/msg00032.html . > > Joseph Coveney > > > * > * 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/ -- May Antonnette O. Lebanan Researcher Biostatistician Indicium Research Services --> click to see the Facebook page mlebanan@gmail.com * * 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/