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st: error message when using gllamm "insufficient observations"


From   Karen Ruckman <ruckman@sfu.ca>
To   "statalist " <statalist@hsphsun2.harvard.edu>
Subject   st: error message when using gllamm "insufficient observations"
Date   Mon, 25 Mar 2013 11:32:15 -0700 (PDT)

hello statalisters,

i am trying to use -gllamm- to do a 2 stage endogenous system where one stage is a survival estimation.  before i attempt this, i thought i would try to run a simple one stage poisson regression using -gllamm- to compare it to a stcox to make sure i am doing it correctly.  but i keep getting an error message of "insufficient observations" when trying to run -gllamm-.  any ideas (other than the obvious) about why this might be occurring?  i am wondering if there is something about the clustering that i haven't done properly.  here is the code:

gllamm6 speed  lr_size  , family(poisson) i(licensor_numb)

here are the stats on the clustering variable:
. sum licensor_numb

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
licensor_n~b |       157    40.18471    24.24417          1         84



karen.

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