Frequencies for first 10,000 rows of mbstate_rec variable in natl2017 dataset :

   Mother's |
 Nativity 1 |
Born in the |
U.S. (50 US |
    States) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,592       85.92       85.92
          2 |      1,384       13.84       99.76
          3 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018