Frequencies for first 10,000 rows of mar variable in natlterr2013 dataset :

   Mother's |
    Marital |
 Status U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,908       39.08       39.08
          2 |      6,092       60.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015