Frequencies for first 10,000 rows of pct012c018 variable in sf12000860us18 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,585       85.85       85.85
          1 |        954        9.54       95.39
          2 |        231        2.31       97.70
          3 |         98        0.98       98.68
          4 |         48        0.48       99.16
          5 |         21        0.21       99.37
          6 |         20        0.20       99.57
          7 |         10        0.10       99.67
          8 |          7        0.07       99.74
          9 |          3        0.03       99.77
         10 |          2        0.02       99.79
         11 |          6        0.06       99.85
         12 |          1        0.01       99.86
         13 |          1        0.01       99.87
         14 |          2        0.02       99.89
         15 |          1        0.01       99.90
         20 |          2        0.02       99.92
         38 |          1        0.01       99.93
         40 |          1        0.01       99.94
         43 |          1        0.01       99.95
         48 |          1        0.01       99.96
         55 |          1        0.01       99.97
         59 |          2        0.02       99.99
         83 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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