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st: dropped groups in xtlogit fixed effects


From   rdae20@bath.ac.uk
To   statalist@hsphsun2.harvard.edu
Subject   st: dropped groups in xtlogit fixed effects
Date   Thu, 01 Apr 2010 14:13:07 +0100

Dear Statalisters,

I want to use a logit regression on panel data with country fixed effects, therefore I am using xtlogit with fe at the end.

However I am getting two notes that i do not fully understand.

1st, Multiple positive outcomes within groups encountered
2nd, x groups (x obs) dropped becasue of all positive or all negative outcomes

can anybody explain what these mean and if they are a problem? It almost halves my sample which may be a bit of an issue.

I must apologize for my stata ignorance, I am new a stata newby

Many thanks in advance for any help you may be able to offer,

Richard


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