Frequencies for first 10,000 rows of PCT012A099 variable in sf12000860us16 dataset :

   96 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,768       77.68       77.68
          1 |      1,362       13.62       91.30
          2 |        482        4.82       96.12
          3 |        189        1.89       98.01
          4 |         77        0.77       98.78
          5 |         58        0.58       99.36
          6 |         27        0.27       99.63
          7 |         14        0.14       99.77
          8 |          9        0.09       99.86
          9 |          6        0.06       99.92
         10 |          4        0.04       99.96
         12 |          2        0.02       99.98
         15 |          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