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st: xtmixed and no of obs per group


From   saurav pathak <sauravicbs@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: xtmixed and no of obs per group
Date   Tue, 23 Feb 2010 15:12:56 +0000

Dear All
I am using a data set with 40K observations. I have 14 Independent Variables
(IV) in the xtmixed command. The observations are grouped into a group
variable, the number of groups are 5000. When I use  *estat group *I see
that the average number of observations per group is 8.

My question now is whether the average number of obs = 8 which is less than
the total number of IV which is  14 will have a bad effect (indeterminacy)
on the estimates of xtmixed, or, is it acceptable to have such a situation
where the avg no of obs per group could be less than the number of IVs

Kindly help me with is
Thanks
Saurav
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