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From | kmacdonald@stata.com (Kristin MacDonald, StataCorp LP) |
To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
Subject | Re: st: Adding a time-invariant covariate in SEM builder |
Date | Wed, 01 May 2013 17:20:31 -0500 |
Robert Long <W.R.Long@leeds.ac.uk> is fitting a latent growth curve model with time-invariant covariates and asked how to include an intercept in an equation for a latent variable when using the SEM Builder. > After fitting the growth model (that is, the model with just the latent > growth factors and the measured variables), I add a time-invariant (in > this case "male") covariate in the do file like this: > > 1. add the path: (Intercept Slope <- male _cons) > 2. remove the means() option > 3. and add e. to the factor covariances (if any) > > No problem with that. > > My question is how to achieve the the same thing with SEM builder ? > Specifically, how do I get _cons into the paths from the time-invariant > covariate to the latent growth factors ? Robert can include a box in the diagram representing the constant. To do this 1. Use the Add Observed Variable tool to drop a box on the path diagram; 2. In the contextual toolbar, type _cons in the box next to "Variable:" and press Enter; 3. Draw paths from the _cons box to the latent variables. Robert can now fit the same model from the Builder that he fits using command syntax. -- Kristin kmacdonald@stata.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/