st: xtgls - expected values of residuals different from 0

[Matthieu Boussichas <m.boussichas@u-clermont1.fr>]

Hi everybody,

i have a problem with xtgls. I am estimating a panel data model with AR1 
correlation using the xtgls method.

xtgls lentped0p  lhdi_hmg lgnimoyppvd lang louvcom llatmini, 
panels(hetero) corr(ar1) force

When I calculate the expected value of  residuals , i have something 
different from 0.
I have this problem whatever options i put. (I use Stata 8)
I don't know where i could find the answer so could you help me  please ?

Thanks

Boussichas matthieu

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