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Stata FAQ
How can I get an R2 with robust regression (rreg)?

Interestingly enough, Stata's rreg command computes an R-squared, it just doesn't display it. Here is how you can display R-squared, adjusted R-squared, and the RMSE. We will illustrate this using the hsb2 dataset. 
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear

rreg write female read math

   Huber iteration 1:  maximum difference in weights = .53165996
   Huber iteration 2:  maximum difference in weights = .03680988
Biweight iteration 3:  maximum difference in weights = .15838504
Biweight iteration 4:  maximum difference in weights = .00685531

Robust regression                                      Number of obs =     200
                                                       F(  3,   196) =   65.12
                                                       Prob > F      =  0.0000

------------------------------------------------------------------------------
       write |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
      female |   5.395741   .9852906     5.48   0.000     3.452609    7.338873
        read |   .2969854   .0640016     4.64   0.000     .1707651    .4232057
        math |   .4267256   .0699755     6.10   0.000      .288724    .5647271
       _cons |   12.00214   3.016833     3.98   0.000     6.052521    17.95176
------------------------------------------------------------------------------

display "R2 = " e(r2)

R2 = .49918786

display "adjusted R2 = " e(r2_a)

adjusted R2 = .49152237

display "RMSE = " e(rmse)

RMSE = 6.92879

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