Frequencies for first 10,000 rows of mbrace variable in natlterr2015 dataset :

    Bridged |
Race Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,160       41.60       41.60
          2 |        555        5.55       47.15
          3 |         14        0.14       47.29
          4 |      5,271       52.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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