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Re: st: Latent class estimation


From   David Airey <david.airey@Vanderbilt.Edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Latent class estimation
Date   Wed, 5 Dec 2007 07:32:09 -0600

Eva,

Another program that can be used for just about any latent variable modeling question whether continuous or categorical, even multilevel, is Mplus, now at version 5.

-Dave


On Dec 5, 2007, at 7:01 AM, Dimitris Pavlopoulos wrote:


Dear Eva,

I have not explored the potential of STATA in latent class models, but I would suggest you to do your analysis in Latent Gold instead. This is a program especially made for such analysis. And yes, you need to use the EM algorithm and in particular its modified version (Baum Weltch algorithm or something like that). This is implemented in Latent Gold.

best,
Dimitris



Quoting Eva Poen <eva.poen@gmail.com>:


Dear all,

I am interested in running a latent class regression model. I need to
estimate the class-specific regression models for the outcome variable
y (with covariates x) and the coefficients for the class prediction
equation (with covariates z). Before I can embark on such a project in
Stata, I need to do some more reading though. The standard
econometrics textbooks are silent on the matter of latent classes, and
it is unclear to me how the likelihood function is constructed. If
someone could recommend a good book/article detailing this method,
that would be great.

My specific questions are:
- Do I need to use the EM algorithm, or can I use standard maximum likelihood?
- Can a latent class model accommodate cross-sectional time series data?
- Can the sets of covariates x and z be overlapping?
- Can x contain lagged values of y? Do I need to use instruments for those?
- Can I have clustered data within the latent classes? (standard
errors adjusted for clustering, as in standard Stata regression
commands -cluster(...)- )


I'd be very grateful for any hints.
Thanks a lot,
Eva
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David C. Airey, Ph.D.
Pharmacology Research Assistant Professor
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