Frequencies for first 10,000 rows of pct012c047 variable in sf12000860us18 dataset :

   44 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,552       85.52       85.52
          1 |      1,038       10.38       95.90
          2 |        230        2.30       98.20
          3 |         83        0.83       99.03
          4 |         42        0.42       99.45
          5 |         22        0.22       99.67
          6 |          6        0.06       99.73
          7 |          4        0.04       99.77
          8 |          7        0.07       99.84
          9 |          2        0.02       99.86
         10 |          2        0.02       99.88
         11 |          1        0.01       99.89
         14 |          1        0.01       99.90
         17 |          1        0.01       99.91
         18 |          1        0.01       99.92
         20 |          1        0.01       99.93
         23 |          1        0.01       99.94
         25 |          1        0.01       99.95
         26 |          1        0.01       99.96
         39 |          1        0.01       99.97
         42 |          1        0.01       99.98
         53 |          1        0.01       99.99
         65 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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