Frequencies for first 10,000 rows of pct012c201 variable in sf12000860us18 dataset :

   94 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,971       99.71       99.71
          1 |         28        0.28       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017