Frequencies for first 10,000 rows of pct013c008 variable in sf12000860us31 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,684       86.84       86.84
          1 |        843        8.43       95.27
          2 |        253        2.53       97.80
          3 |         92        0.92       98.72
          4 |         58        0.58       99.30
          5 |         23        0.23       99.53
          6 |          9        0.09       99.62
          7 |          7        0.07       99.69
          8 |          6        0.06       99.75
          9 |          7        0.07       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
         16 |          1        0.01       99.90
         20 |          1        0.01       99.91
         26 |          1        0.01       99.92
         27 |          1        0.01       99.93
         31 |          1        0.01       99.94
         33 |          1        0.01       99.95
         40 |          1        0.01       99.96
         41 |          1        0.01       99.97
         46 |          1        0.01       99.98
         65 |          1        0.01       99.99
         79 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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