Frequencies for first 10,000 rows of pct012e051 variable in sf12000860us20 dataset :

   48 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,844       98.44       98.44
          1 |        143        1.43       99.87
          2 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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