Frequencies for first 10,000 rows of pct012o066 variable in sf12000860us30 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,489       84.89       84.89
          1 |      1,024       10.24       95.13
          2 |        278        2.78       97.91
          3 |         94        0.94       98.85
          4 |         43        0.43       99.28
          5 |         19        0.19       99.47
          6 |         18        0.18       99.65
          7 |          7        0.07       99.72
          8 |         11        0.11       99.83
          9 |          1        0.01       99.84
         10 |          4        0.04       99.88
         11 |          2        0.02       99.90
         12 |          5        0.05       99.95
         13 |          2        0.02       99.97
         14 |          1        0.01       99.98
         18 |          1        0.01       99.99
         30 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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