Frequencies for first 10,000 rows of mrace variable in natl2001 dataset :

    Race of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,726       67.26       67.26
          2 |      3,176       31.76       99.02
          3 |         30        0.30       99.32
          4 |         15        0.15       99.47
          6 |          1        0.01       99.48
          7 |          6        0.06       99.54
         78 |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015