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st: Fw: QUESTION FOR LISTSERVER


From   Charles Van Liew <cavanliew@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Fw: QUESTION FOR LISTSERVER
Date   Thu, 13 Dec 2012 15:46:20 -0800 (PST)

Hello,

I am trying to figure out how to model a conditional latent growth curve analysis in Stata's GUI.  Basically, I am trying to mimic results that were obtained using MPlus.  I can model an unconditional latent growth curve analysis in the GUI by erecting a model with two latent variables (Intercept & Slope) that are indicated by the observed variables (e.g., 4 repeated measures of "x").  By constraining the constant values for the "x" observed variables to 0 (do not estimate), the x -> Intercept paths to 1, and x -> Slope paths to 0, 1, 2, and 3, respectively.  However, when I attempt free any of the paths (e.g., x3 -> Slope and x4 -> Slope), so that a conditional model can be estimated the results no longer remain consistent with MPlus.  Am I missing something?

Thanks!

Best,
Charles

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