Frequencies for first 10,000 rows of mrace variable in natl1975 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |      6,609       66.09       66.10
          2 |      3,346       33.46       99.56
          3 |          2        0.02       99.58
          4 |          4        0.04       99.62
          5 |          3        0.03       99.65
          7 |          6        0.06       99.71
          8 |          2        0.02       99.73
          9 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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