Frequencies for first 10,000 rows of pct012e071 variable in sf12000860us20 dataset :

   68 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,946       99.46       99.46
          1 |         52        0.52       99.98
          2 |          1        0.01       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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