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From | Nick Cox <njcoxstata@gmail.com> |
To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
Subject | Re: st: regress |
Date | Tue, 27 Aug 2013 17:22:02 +0100 |
You asked a similar question on 14 August and got two replies http://www.stata.com/statalist/archive/2013-08/msg00546.html http://www.stata.com/statalist/archive/2013-08/msg00548.html Why not consider and reply to those comments, which it seems remain pertinent? Nick njcoxstata@gmail.com On 27 August 2013 16:32, Rezgar Mohammed <mohamm52@msu.edu> wrote: > > 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. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/