st: some questions about gllamm

["stata_user stata_user" <stata_dofile@hotmail.co.uk>]

Dear All,
I am using for the moment the gllamm model to fit a random intercept model 
with individual nested within countries

Dependent variable is continuous

independent variables  are continuous and discrete, I would like to compare 
between different models (adding more covariates ect....)

How I can use log likelihood test?

My second question concerns checking collinearity? the vif command is not 
working for the gllamm, how to test if there is collinearity among the 
covariates?

Thanks a lot for any suggestion

Sami

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