st: 'xtgee' for logistic regression

["Nora Ghaemi" <nghaemi@hotmail.com>]

dear statalisters,

i have to run a logistic regression that has to take into account clustering 
of subjects into families.
the command 'logistic' works but does not account for clustering, so the 
standard errors are smaller that they should be.

i am trying to use on the same dataset the command xtgee:

xtgee  dep_var indep_var, family(binomial) link(logit) i(id)


but invariably i get this response from stata:

estimates diverging (absolute correlation > 1)
r(430);


should I rearrange the data somehow in order to run �xtgee�? it was my 
understanding that xtgee does not need to �tsset�

can anyone help me with this issue?

thanks a lot!

nora

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