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Re: st: interaction in SEM


From   Stas Kolenikov <skolenik@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interaction in SEM
Date   Wed, 7 Dec 2011 09:09:42 -0600

Stata's -sem- does not support nonlinear latent variable models.
However, you might be able to set this up in -gllamm- if t is an
observed variable.

Frankly, I am not sure your model is identified.

On Wed, Dec 7, 2011 at 8:25 AM, Zhi Su <su.zh@husky.neu.edu> wrote:
> Hi, dear Statalists,
>
>  I want to use "sem" for a structural equation model, where Y is
> outcome, x is colntorl variable, t is variable with interest, A is a
> latent variable. The latent variable has two indicators :a1 a2. I want
> to run a model as the following.
>
> Y<-x t t*A
> A<-x
> a1<-A
> a2<-A
>
> Here is the problem. t*A is the interaction term between A and t, and
> Stata return that "t*A" is an unknown variable. The interaction term
> can not be generated to be an variable by using "generate" because A
> is a latent variable. How can I use an interaction term between latent
> variable and observed variable in "sem"? Thanks!
>
> --
> Zhi Su
> 348 Holmes Hall
> Northeastern University
> 360 Huntington Avenue
> Boston, MA 02115
> Office:1-617-373-2316
> email:su.zh@husky.neu.edu
> *
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> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/



-- 
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.

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