Frequencies for first 10,000 rows of mbrace variable in natlterr2006 dataset :

   Mother's |
    Bridged |
Race** R*** |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |      3,383       33.83       33.84
          2 |        341        3.41       37.25
          . |      6,275       62.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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