Frequencies for first 10,000 rows of pct012e077 variable in sf12000860us20 dataset :

   74 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,961       99.61       99.61
          1 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017