Frequencies for first 10,000 rows of pct012c139 variable in sf12000860us18 dataset :

   32 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,572       85.72       85.72
          1 |        972        9.72       95.44
          2 |        258        2.58       98.02
          3 |         85        0.85       98.87
          4 |         39        0.39       99.26
          5 |         22        0.22       99.48
          6 |         13        0.13       99.61
          7 |         11        0.11       99.72
          8 |          9        0.09       99.81
          9 |          4        0.04       99.85
         10 |          2        0.02       99.87
         12 |          2        0.02       99.89
         13 |          1        0.01       99.90
         18 |          1        0.01       99.91
         19 |          1        0.01       99.92
         21 |          1        0.01       99.93
         26 |          1        0.01       99.94
         30 |          1        0.01       99.95
         34 |          1        0.01       99.96
         42 |          1        0.01       99.97
         63 |          1        0.01       99.98
         68 |          1        0.01       99.99
         71 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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