Frequencies for first 10,000 rows of mbrace variable in natl2015 dataset :

    Bridged |
Race Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,385       63.85       63.85
          2 |        458        4.58       68.43
          3 |      2,170       21.70       90.13
          4 |        987        9.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016