Frequencies for first 10,000 rows of pct012k018 variable in sf12010880us30 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,151       91.51       91.51
          1 |        611        6.11       97.62
          2 |        146        1.46       99.08
          3 |         58        0.58       99.66
          4 |         18        0.18       99.84
          5 |          2        0.02       99.86
          6 |          6        0.06       99.92
          7 |          1        0.01       99.93
          8 |          1        0.01       99.94
          9 |          1        0.01       99.95
         10 |          1        0.01       99.96
         11 |          1        0.01       99.97
         12 |          2        0.02       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017