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st: MIME-Version: 1.0


From   Tharshini Thangavelu <thth4658@student.su.se>
To   statalist@hsphsun2.harvard.edu
Subject   st: MIME-Version: 1.0
Date   Fri, 25 Sep 2009 16:49:18 +0200 (CEST)

Hi statalist,

When I use the OLS, I would like to know whether the included covariates are
jointly significant, that is if they should be included in the model. I want to
test a F statistic for the overall significance of a regression? How do I do
this? Or is this results already computed in the outcome of the regression
output. Is the F (7, 2151) = 176 and Prob > F = 0.0000 the F test?


. reg ha medu ethnicity female ageinmonth agesquare  childeweight mage, r

Linear regression                                      Number of obs =    2159
                                                       F(  7,  2151) =  176.90
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.4400
                                                       Root MSE      =   1.159

------------------------------------------------------------------------------
             |               Robust
          ha |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
        medu |   .1686295   .0274034     6.15   0.000     .1148897    .2223694
   ethnicity |    .040194   .0572155     0.70   0.482    -.0720094    .1523974
      female |   .4656059   .0510575     9.12   0.000     .3654787     .565733
  ageinmonth |  -.2404885   .0082513   -29.15   0.000      -.25667   -.2243071
   agesquare |   .0022284   .0001083    20.57   0.000      .002016    .0024409
childeweight |   .0484869   .0019144    25.33   0.000     .0447327    .0522412
        mage |   .0029801   .0037242     0.80   0.424    -.0043233    .0102835
       _cons |  -2.853446   .1739336   -16.41   0.000    -3.194542   -2.512351
------------------------------------------------------------------------------

Thanks
Tharshini
-- 
Tharshini THANGAVELU
Forskarbacken 8 / 101
114 16 Stockholm
Sweden
Phone +46 (0)735 53 43 90
E-mail thth4658@student.su.se
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