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st: creating constraints in panel data
From
"Martinez San Roman, Valeriano" <[email protected]>
To
<[email protected]>
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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