Frequencies for first 10,000 rows of mrace variable in natl1977 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,473       64.73       64.73
          2 |      3,492       34.92       99.65
          3 |          2        0.02       99.67
          4 |          3        0.03       99.70
          7 |         24        0.24       99.94
          8 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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