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

   Mother's |
 Nativity 1 |
Born in the |
U.S. (50 US |
    States) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,737       87.37       87.37
          2 |      1,224       12.24       99.61
          3 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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