Frequencies for first 10,000 rows of pct012e180 variable in sf12000860us20 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,944       99.44       99.44
          1 |         53        0.53       99.97
          2 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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