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st: RE: xtmelogit and inital values not feasible r(1400) error


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: xtmelogit and inital values not feasible r(1400) error
Date   Mon, 2 Nov 2009 17:58:13 -0000

In general, remote diagnosis is difficult for this kind of problem. A
visceral suspicion is that you may be trying to fit a model much more
complicated than the data are willing to bear. From your account, you
are fitting in a high-dimensional parameter space, even if you have lots
of observations. 

To steal one of Maarten's lines: start with something much simpler and
see whether it too is problematic. If not, build up to this model,
paying attention to variables that don't seem to help. 

Nick 
n.j.cox@durham.ac.uk 

Jennifer Schmitt

I am running the following model
xi. xtmelogit knew_SNP i.villagecode i.area i.tribegroup snp_distance 
cpa_distance age sex etc (I have another 25+ variables, mostly 
dichotomous) || subvillage_code: || household_id:

I then get an "initial values not feasible r(1400)" error.  I tried to 
work around the problem by telling STATA to start with initial values 
from a simple logit command (using the "-from()-" command), but it still

reports the error.  I also considered extreme values, but those are not 
an issue.  Any thoughts or suggestions would be greatly appreciated!

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