st: xtivreg, fe: missing R-sq within interpretation.

["Guillaume Frechette" <gurst1@hotmail.com>]

Dear statalisters: after performing a xtivreg, fe command, I noticed that 
the results were strange (very large coefficient estimates as compared to 
similar samples). While trying to determine if I had done anything wrong, I 
noticed that R-sq: within = . (it is set to missing). Can someone tell me 
how to interpret this. Does this mean there is a problem? If so, what can 
you tell me about it? Thanks in advance.

g


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