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st: creating constraints in panel data


From   "Martinez San Roman, Valeriano" <valeriano.martinez@unican.es>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: creating constraints in panel data
Date   Wed, 3 Mar 2010 11:41:08 +0100

Dear Stata users,

I hope you can help me. I am trying to estimate a cobb-douglas function
(Y=X1^a*X2^b*X3^c*....) using panel data with fixed effects.

I am using the log of the production function as my functional form,
that is, Ln(Y) = aLn(X1) + bLn(X2) + cLn(X3)+....

And I need to assume that the sum of the exponentials must be equal to 1
(a+b+c+...=1)

Can I make such constraint for panel data models? I know I can use
"cnsreg" command, but this is not panel data estimation, and it is not
valid in may case.

Thank you very much,
Valeriano



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