st: Latent Growth Curve SEM GUI

[Carter Rees <carterrees@gmail.com>]

Using Stata 12 on a Mac. 

I have the basic latent growth curve model with 4 time points set up using the SEM GUI. I would like to add one time invariant covariate (gender) to predict the growth factors (intercept and slope) using the GUI. However, each time I try to add this variable either as latent or observed I get the error message "Cannot add path. Target variable will become endogenous and is correlated with exogenous variables". How do I add this via the GUI?

My goal is to replicate the results of an example from MPlus so I can get a better feel for what the Stata code will look like and how the GUI works. No troubles fitting the LGC without the covariate but the covariate is stumping me.

Thanks.

Carter

/*LGC without covariate*/
sem (posT1 <- intercept@1 slope@0 _cons@0) ///
(posT2 <- intercept@1 slope@1 _cons@0) ///
(posT3 <- intercept@1 slope@2 _cons@0) ///
(posT4 <- intercept@1 slope@3 _cons@0), ///
latent(intercept slope) ///
var(e.posT1@var e.posT2@var e.posT3@var e.posT4@var) ///
means(intercept slope)






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