Frequencies for first 10,000 rows of mrace variable in natl1972 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,670       66.70       66.70
          2 |      3,287       32.87       99.57
          4 |          1        0.01       99.58
          5 |          4        0.04       99.62
          6 |          1        0.01       99.63
          7 |         27        0.27       99.90
          8 |          1        0.01       99.91
          9 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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