Frequencies for first 10,000 rows of pct012c127 variable in sf12000860us18 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,663       86.63       86.63
          1 |        866        8.66       95.29
          2 |        243        2.43       97.72
          3 |         93        0.93       98.65
          4 |         52        0.52       99.17
          5 |         28        0.28       99.45
          6 |         14        0.14       99.59
          7 |         15        0.15       99.74
          8 |          5        0.05       99.79
          9 |          5        0.05       99.84
         10 |          1        0.01       99.85
         11 |          2        0.02       99.87
         12 |          1        0.01       99.88
         15 |          2        0.02       99.90
         16 |          1        0.01       99.91
         19 |          1        0.01       99.92
         23 |          1        0.01       99.93
         29 |          1        0.01       99.94
         31 |          1        0.01       99.95
         35 |          1        0.01       99.96
         61 |          1        0.01       99.97
         77 |          1        0.01       99.98
         78 |          1        0.01       99.99
         84 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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