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st: xtreg fixed effect with time trend; constant


From   david reinstein <daaronr@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: xtreg fixed effect with time trend; constant
Date   Thu, 17 Jul 2003 02:36:45 -0700 (PDT)

I try to do an xtreg fixed effect  including a
variable that represents the year of the data
observation.  I assume the coefficient on this should
be an an average time trend.  The coefficients I get
are plausible, but the "constant" blows up weirdly --
to a level much higher (or lower) than the average of
the dependent variable could possibly be.
Anyone know why?
Anyone know how to impose a time trend (or better,
several time trends for several subgroups) within the
context of a panel FE model?
Thanks,
David


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