Frequencies for first 10,000 rows of pct012k018 variable in sf12000860us26 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,849       88.49       88.49
          1 |        852        8.52       97.01
          2 |        154        1.54       98.55
          3 |         65        0.65       99.20
          4 |         32        0.32       99.52
          5 |          9        0.09       99.61
          6 |         12        0.12       99.73
          7 |          4        0.04       99.77
          8 |          4        0.04       99.81
          9 |          1        0.01       99.82
         10 |          3        0.03       99.85
         11 |          1        0.01       99.86
         12 |          1        0.01       99.87
         13 |          2        0.02       99.89
         14 |          1        0.01       99.90
         18 |          1        0.01       99.91
         20 |          1        0.01       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
         54 |          1        0.01       99.97
         58 |          1        0.01       99.98
         59 |          1        0.01       99.99
         81 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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