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Re: st: xt commands for parallel growth curves


From   William Buchanan <william@williambuchanan.net>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: xt commands for parallel growth curves
Date   Tue, 24 Jul 2012 21:44:46 -0700

Hi Alan,

I've not researched this at all yet, but maybe it would be possible to fit this type of model using -gllamm- or -cmp- (both can be found easily using the -findit- command).  The only other idea that I have is to look into using Mata with the appropriate matrices, which may be easier said than done.

HTH,
Billy

Sent from my iPhone

On Jul 24, 2012, at 21:18, Alan Acock <acock@mac.com> wrote:

> I have parallel growth curves. One is a growth curve for a variable called secd which is a count variable and the other growth curve is for negative behavior, also a count. I can estimate either growth curve readilly using xtmepoisson, but I'm interested in estimating the relationship between them. That is, as secd goes up, does negative behavior go down. I would like to estimate them simultaneously as you can do with Mplus. I also have this data clustered by school. So I have 8 waves of data for each child and 15 schools.
> 
> I could use Stata's sem to estimate parallel growth curves and see how they are related, but it is restricted to continuous variables.
> 
> Alan Acock
> acock@mac.com
> A
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