Frequencies for first 10,000 rows of pct012e091 variable in sf12000860us20 dataset :

   88 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,987       99.87       99.87
          1 |         12        0.12       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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