Frequencies for first 10,000 rows of pct012n023 variable in sf12000860us29 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,132       91.32       91.32
          1 |        569        5.69       97.01
          2 |        136        1.36       98.37
          3 |         50        0.50       98.87
          4 |         28        0.28       99.15
          5 |         19        0.19       99.34
          6 |         11        0.11       99.45
          7 |         12        0.12       99.57
          8 |          3        0.03       99.60
          9 |          4        0.04       99.64
         10 |          7        0.07       99.71
         11 |          2        0.02       99.73
         12 |          4        0.04       99.77
         13 |          4        0.04       99.81
         15 |          1        0.01       99.82
         16 |          1        0.01       99.83
         19 |          2        0.02       99.85
         21 |          2        0.02       99.87
         22 |          1        0.01       99.88
         25 |          1        0.01       99.89
         26 |          1        0.01       99.90
         28 |          1        0.01       99.91
         29 |          1        0.01       99.92
         31 |          1        0.01       99.93
         33 |          1        0.01       99.94
         55 |          1        0.01       99.95
         59 |          1        0.01       99.96
         64 |          1        0.01       99.97
         82 |          1        0.01       99.98
         92 |          1        0.01       99.99
        132 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017