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st: regress


From   Rezgar Mohammed <[email protected]>
To   [email protected]
Subject   st: regress
Date   Tue, 27 Aug 2013 11:32:18 -0400

Hello,
I am a beginner in Econ. I would like to test the effect of some factors on the production of specific output using the Cobb-Douglass production function. I would like to know if you have any concerns about the results. Y represents output, x1 labor, x2 fertilizer, x3 land, x4 seed and x5 is capital. I wonder why the x1 coefficient is negative for example.


reg lny lnx1 lnx2 lnx3 lnx4 lnx5

      Source |       SS       df       MS              Number of obs =     160
-------------+------------------------------           F(  5,   154) =22942.46
       Model |  1.13880167     5  .227760334           Prob > F      =  0.0000
    Residual |  .001528829   154  9.9275e-06           R-squared     =  0.9987
-------------+------------------------------           Adj R-squared =  0.9986
       Total |   1.1403305   159   .00717189           Root MSE      =  .00315

------------------------------------------------------------------------------
         lny |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
        lnx1 |  -.0398971   .0008289   -48.13   0.000    -.0415346   -.0382596
        lnx2 |   1.063405   .0033848   314.17   0.000     1.056719    1.070092
        lnx3 |  -.0008994   .0005395    -1.67   0.098    -.0019652    .0001664
        lnx4 |   .0023421   .0024396     0.96   0.339    -.0024772    .0071615
        lnx5 |   .0025708    .000884     2.91   0.004     .0008245    .0043171
       _cons |  -.3304083   .0228141   -14.48   0.000    -.3754774   -.2853393
------------------------------------------------------------------------------

I tested for heteroskedasticity and auto-correlation but nothing changes.


Thank you.


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