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Re: RE: st: RE: constraints insufficient for unique estimate
At 11:07 PM 8/10/2005 -0500, Zeynal Karaca wrote:
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.
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...
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 Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc
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