Frequencies for first 10,000 rows of pct012o128 variable in sf12000860us30 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,230       72.30       72.30
          1 |      1,142       11.42       83.72
          2 |        513        5.13       88.85
          3 |        287        2.87       91.72
          4 |        174        1.74       93.46
          5 |        134        1.34       94.80
          6 |        100        1.00       95.80
          7 |         86        0.86       96.66
          8 |         44        0.44       97.10
          9 |         50        0.50       97.60
         10 |         38        0.38       97.98
         11 |         36        0.36       98.34
         12 |         30        0.30       98.64
         13 |         22        0.22       98.86
         14 |         18        0.18       99.04
         15 |         16        0.16       99.20
         16 |          8        0.08       99.28
         17 |         14        0.14       99.42
         18 |          2        0.02       99.44
         19 |          3        0.03       99.47
         20 |          3        0.03       99.50
         21 |          7        0.07       99.57
         22 |          5        0.05       99.62
         23 |          1        0.01       99.63
         24 |          5        0.05       99.68
         25 |          2        0.02       99.70
         26 |          2        0.02       99.72
         27 |          5        0.05       99.77
         28 |          2        0.02       99.79
         29 |          2        0.02       99.81
         30 |          3        0.03       99.84
         31 |          1        0.01       99.85
         32 |          2        0.02       99.87
         33 |          1        0.01       99.88
         35 |          1        0.01       99.89
         36 |          2        0.02       99.91
         41 |          1        0.01       99.92
         42 |          1        0.01       99.93
         43 |          1        0.01       99.94
         48 |          1        0.01       99.95
         49 |          1        0.01       99.96
         51 |          1        0.01       99.97
         53 |          1        0.01       99.98
         68 |          1        0.01       99.99
         76 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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