Frequencies for first 10,000 rows of mar variable in natlterr2005 dataset :

   Mother's |
    Marital |
 Status U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,636       46.36       46.36
          2 |      5,363       53.63       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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