Frequencies for first 10,000 rows of pct013c032 variable in sf12000860us31 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,770       87.70       87.70
          1 |        814        8.14       95.84
          2 |        221        2.21       98.05
          3 |         76        0.76       98.81
          4 |         51        0.51       99.32
          5 |         26        0.26       99.58
          6 |          8        0.08       99.66
          7 |         13        0.13       99.79
          8 |          3        0.03       99.82
          9 |          2        0.02       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
         81 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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