Frequencies for first 10,000 rows of sex variable in person dataset :

        Sex |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,679       66.79       66.79
          2 |      3,012       30.12       96.91
          9 |        309        3.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016