Frequencies for pbsex variable in pbtype dataset :

        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,478       71.61       71.61
          2 |      1,763       28.19       99.81
          8 |         10        0.16       99.97
          9 |          2        0.03      100.00
------------+-----------------------------------
      Total |      6,253      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016