Frequencies for first 10,000 rows of pct012e159 variable in sf12000860us20 dataset :

   52 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,808       98.08       98.08
          1 |        188        1.88       99.96
          2 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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