Frequencies for first 10,000 rows of pct012c057 variable in sf12000860us18 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,947       89.47       89.47
          1 |        811        8.11       97.58
          2 |        154        1.54       99.12
          3 |         45        0.45       99.57
          4 |         18        0.18       99.75
          5 |          7        0.07       99.82
          6 |          4        0.04       99.86
          7 |          2        0.02       99.88
         11 |          1        0.01       99.89
         12 |          1        0.01       99.90
         15 |          1        0.01       99.91
         16 |          1        0.01       99.92
         17 |          1        0.01       99.93
         18 |          1        0.01       99.94
         19 |          1        0.01       99.95
         24 |          1        0.01       99.96
         26 |          1        0.01       99.97
         40 |          1        0.01       99.98
         41 |          1        0.01       99.99
         55 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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