Frequencies for first 10,000 rows of pct012g178 variable in sf12000860us22 dataset :

   71 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,486       84.86       84.86
          1 |        925        9.25       94.11
          2 |        263        2.63       96.74
          3 |        112        1.12       97.86
          4 |         62        0.62       98.48
          5 |         40        0.40       98.88
          6 |         21        0.21       99.09
          7 |         21        0.21       99.30
          8 |         18        0.18       99.48
          9 |         18        0.18       99.66
         10 |          8        0.08       99.74
         11 |          8        0.08       99.82
         12 |          7        0.07       99.89
         13 |          3        0.03       99.92
         14 |          3        0.03       99.95
         15 |          1        0.01       99.96
         16 |          2        0.02       99.98
         17 |          1        0.01       99.99
         18 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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