Frequencies for first 10,000 rows of mrace variable in natl1976 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,451       64.51       64.51
          2 |      3,518       35.18       99.69
          3 |          1        0.01       99.70
          4 |          3        0.03       99.73
          6 |          1        0.01       99.74
          7 |         24        0.24       99.98
          8 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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