Frequencies for first 10,000 rows of pct012c023 variable in sf12000860us18 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,528       85.28       85.28
          1 |        902        9.02       94.30
          2 |        284        2.84       97.14
          3 |        115        1.15       98.29
          4 |         64        0.64       98.93
          5 |         37        0.37       99.30
          6 |         15        0.15       99.45
          7 |         13        0.13       99.58
          8 |          8        0.08       99.66
          9 |         10        0.10       99.76
         10 |          3        0.03       99.79
         11 |          2        0.02       99.81
         12 |          1        0.01       99.82
         13 |          2        0.02       99.84
         14 |          2        0.02       99.86
         16 |          1        0.01       99.87
         21 |          1        0.01       99.88
         26 |          3        0.03       99.91
         27 |          1        0.01       99.92
         31 |          2        0.02       99.94
         39 |          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
         81 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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