Re: st: xtmixed

[William Buchanan <william@williambuchanan.net>]

Hi Carol,

Nick Cox sent out an email a few days ago with some useful information that would help you get a useful response to your query.  The first (and one of the most important things) is to include "exactly" what you typed and what Stata returned.  In the case here, where you most likely aren't able to share your data, you should try to reproduce the issue you are facing with one of the system installed datasets.  

HTH,

Billy



On Jan 3, 2013, at 3:10 PM, Sun, Wensheng wrote:

> Dear statalist,
> 
> Please help.
> 
> xtmixed depvar time(indepvar1) i.treatment(indepvar2) timextreatment(interaction), ||id:time, covariance(unstructured) residuals(independent) mle variance
> 
> I want indepvar1 (time) to be random in coefficient and  intercept, eg. each id has its own slope and overall, different treatment has different slope at each time point. However, when I do 
> margins treatment, at(time=(0 6 12 24)) then marginsplot, I got two straight parallel lines. How should I fix that?
> 
> Thank you very much!
> 
> I have sent the same email before. However, I found some of the text has been changed during the process. That's why I send it again. Thanks. 
> 
> Carol
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