Frequencies for first 10,000 rows of mbstate_rec variable in natl2014 dataset :

   Mother's |
 Nativity 1 |
Born in the |
U.S. (50 US |
    States) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,869       88.69       88.69
          2 |      1,097       10.97       99.66
          3 |         34        0.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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