st: GLLAMM: how fast for models with latent variables?

[Philippe Huber <philippe_huber@freesurf.ch>]

Hello all,

 

I am just new here. I started using Stata this week because I want to estimate models with latent variables. I’m trying to use gllamm and I am a little bit confused.

 

My model is rather simple: there are 10 manifest variables (5 normal and 5 binomial), 2 latent variables (or factors) and no covariates. I experienced that the latent variables have free variance and the first loading for each is set to 1. Is it possible to free these loadings and set the factors variances to 1?

 

Secondly, I used 8 adaptive quadrature points and my sample is only 60 observations big. Is it normal that Stata needs about 25 minutes to find a result (I have a 1900MHz CPU)? Am I doing something wrong?

 

I thank you for you help.

 

Sincerely

 

Philippe Huber

Department of Econometrics

University of Geneva

Switzerland