Frequencies for first 10,000 rows of pct012o156 variable in sf12000860us30 dataset :

   49 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,524       75.24       75.24
          1 |      1,308       13.08       88.32
          2 |        480        4.80       93.12
          3 |        249        2.49       95.61
          4 |        137        1.37       96.98
          5 |         93        0.93       97.91
          6 |         52        0.52       98.43
          7 |         24        0.24       98.67
          8 |         25        0.25       98.92
          9 |         23        0.23       99.15
         10 |         19        0.19       99.34
         11 |         12        0.12       99.46
         12 |          4        0.04       99.50
         13 |         11        0.11       99.61
         14 |          6        0.06       99.67
         15 |          6        0.06       99.73
         16 |          3        0.03       99.76
         17 |          7        0.07       99.83
         18 |          3        0.03       99.86
         19 |          1        0.01       99.87
         20 |          3        0.03       99.90
         21 |          1        0.01       99.91
         22 |          2        0.02       99.93
         23 |          1        0.01       99.94
         24 |          2        0.02       99.96
         25 |          1        0.01       99.97
         27 |          2        0.02       99.99
         51 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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