sysuse census, clear
reg marriage i.region

. reg marriage i.region

      Source |       SS       df       MS              Number of obs =      50
-------------+------------------------------           F(  3,    46) =    0.21
       Model |  1.3626e+09     3   454209163           Prob > F      =  0.8874
    Residual |  9.8438e+10    46  2.1400e+09           R-squared     =  0.0137
-------------+------------------------------           Adj R-squared = -0.0507
       Total |  9.9801e+10    49  2.0368e+09           Root MSE      =   46260

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    marriage |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
      region |
          2  |   2957.194   20398.63     0.14   0.885    -38103.13    44017.51
          3  |   10208.47    19274.9     0.53   0.599    -28589.89    49006.82
          4  |  -2900.991   20059.57    -0.14   0.886    -43278.82    37476.84
             |
       _cons |   44479.22   15419.92     2.88   0.006     13440.54    75517.91
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