Frequencies for first 10,000 rows of mrace variable in natl1973 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,567       65.67       65.67
          2 |      3,378       33.78       99.45
          4 |          2        0.02       99.47
          5 |          1        0.01       99.48
          7 |         16        0.16       99.64
          8 |          1        0.01       99.65
          9 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016