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Re: st: estimating production function


From   Scott Merryman <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: estimating production function
Date   Tue, 2 Mar 2010 12:20:48 -0600

Both  -cnsreg- or -frontier- allow linear constraints or -xtreg-
followed by Jeroen Weesie's -linest- (-findit linest- to locate and
download).

Scott


On Mon, Mar 1, 2010 at 5:57 AM, Martinez San Roman, Valeriano
<valeriano.martinez@unican.es> wrote:
> Dear Stata users,
>
> I hope you can help me. I am trying to estimate a cobb-douglas
> production 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 have to assume that we have constant returns to scale, in other
> words, the sum of the exponentials must be equal to 1 (a+b+c+...=1)
>
> Is there a command to restrict the sum of exponentials to be equal to 1.
> How can I do it?
>
> Thank you very much,
> Valeriano
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