Frequencies for first 10,000 rows of pct012e122 variable in sf12000860us20 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,741       97.41       97.41
          1 |        227        2.27       99.68
          2 |         27        0.27       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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