Frequencies for first 10,000 rows of mbrace variable in natlterr2014 dataset :

    Bridged |
Race Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,236       42.36       42.36
          2 |        557        5.57       47.93
          3 |         13        0.13       48.06
          4 |      5,194       51.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016