Frequencies for first 10,000 rows of pct012e056 variable in sf12000860us20 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,839       98.39       98.39
          1 |        153        1.53       99.92
          2 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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