Frequencies for first 10,000 rows of mar variable in natlterr2010 dataset :

   Mother's |
    Marital |
 Status U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,260       42.60       42.60
          2 |      5,740       57.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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