That really all I need to know. It helped me.
Thanks again.
Zeynal Karaca
Texas A&M University
Department of Economics
-------- Original Message --------
==> From: Richard Williams <[email protected]>
==> Date: Wed, 10 Aug 2005 23:23:07 -0500
At 11:07 PM 8/10/2005 -0500, Zeynal Karaca wrote: >gen x1x2=x1 x2
and then replace x1 and x2 with the new x1x2 >and the regression. Is
it okey or is it meaningful to add >two dummy variable of the same
group? I know that it is fine >if they are not dummy variables. >
>if the asnwer to this question is pozitive, then I have >already
solved my problem. if not, please advise me... > >Thanks for
everybody who spent their valuable time to >help me figuring out
the problem...
Adding 2 variables together has the same effect as constraining
their coefficients to be equal. I am not sure why this would solve
all your problems (in fact I'd be rather surprised if it did) but if
that really is all you need, then great.
Incidentally, if you want to use linear constraints but the command
does not support constraints, then Jeroen Weesie's -linest- command
is often the next best thing. Also, something like
test x1=x2, coef
will often give you what you want.
------------------------------------------- Richard Williams, Notre
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