Frequencies for first 10,000 rows of mrace variable in natl1980 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         33        0.33        0.33
          1 |      6,603       66.03       66.36
          2 |      3,348       33.48       99.84
          3 |          6        0.06       99.90
          4 |          6        0.06       99.96
          6 |          1        0.01       99.97
          8 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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