st: AW: dropped groups in xtlogit fixed effects

["Martin Weiss" <martin.weiss1@gmx.de>]

<> 


http://www.stata.com/statalist/archive/2009-10/msg01191.html



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
rdae20@bath.ac.uk
Gesendet: Donnerstag, 1. April 2010 15:13
An: statalist@hsphsun2.harvard.edu
Betreff: st: dropped groups in xtlogit fixed effects

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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