Frequencies for first 10,000 rows of pct012k023 variable in sf12000860us26 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,880       88.80       88.80
          1 |        770        7.70       96.50
          2 |        188        1.88       98.38
          3 |         70        0.70       99.08
          4 |         36        0.36       99.44
          5 |         12        0.12       99.56
          6 |         15        0.15       99.71
          7 |          7        0.07       99.78
          8 |          2        0.02       99.80
          9 |          3        0.03       99.83
         11 |          1        0.01       99.84
         13 |          2        0.02       99.86
         16 |          1        0.01       99.87
         20 |          1        0.01       99.88
         21 |          1        0.01       99.89
         23 |          1        0.01       99.90
         24 |          1        0.01       99.91
         25 |          1        0.01       99.92
         27 |          1        0.01       99.93
         29 |          1        0.01       99.94
         37 |          1        0.01       99.95
         39 |          1        0.01       99.96
         40 |          1        0.01       99.97
         46 |          1        0.01       99.98
         65 |          1        0.01       99.99
         81 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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