Frequencies for first 10,000 rows of pct012e177 variable in sf12000860us20 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,936       99.36       99.36
          1 |         62        0.62       99.98
          2 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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