# Re: st: STATA 10 help

 From Nick Cox 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.
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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.
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Nick

Shimokawa, Kensuke wrote:

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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
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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```