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Re: st: STATA 10 help


From   Nick Cox <n.j.cox@stata.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: STATA 10 help
Date   Fri, 07 Aug 2009 14:46:35 -0500

You have perfect fit, so errors (residuals) are zero, ditto standard errors. This is an extension of the rule that a straight line can be drawn going through any two distinct points.

Scientifically, the indication is that you need to consider a simpler model, or conclude that you do not have enough data to fit this model.

Nick

Shimokawa, Kensuke wrote:

I am currently trying to make a simple regression model where I include myself as a variable influencing the firms revenue. This is for a small presentation I need to make to a firm for a interview process. I have run a multiple regression, but I am getting peculiar results where some of my coefficient variables are dropped and I don't get any numerical values for the certain columns (see below). I will appreciate if I could get your help as soon as possible. Thank you. regress Rev GDP7 DJ NK FTSE UE7 OP
      Source |       SS       df       MS              Number of obs =       6
-------------+------------------------------           F(  5,     0) =       .
       Model |  48697133.3     5  9739426.67           Prob > F      =       .
    Residual |           0     0           .           R-squared     =  1.0000
-------------+------------------------------           Adj R-squared =       .
       Total |  48697133.3     5  9739426.67           Root MSE      =       0

------------------------------------------------------------------------------
         Rev |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
        GDP7 |  (dropped)
          DJ |    42.9947          .        .       .            .           .
          NK |   81.30229          .        .       .            .           .
        FTSE |   287.0798          .        .       .            .           .
         UE7 |  -2196.796          .        .       .            .           .
          OP |   35.09357          .        .       .            .           .
       _cons |  -27760.23          .        .       .            .           .
------------------------------------------------------------------------------


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