Frequencies for first 10,000 rows of pct012c147 variable in sf12000860us18 dataset :

   40 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,431       84.31       84.31
          1 |      1,036       10.36       94.67
          2 |        300        3.00       97.67
          3 |        105        1.05       98.72
          4 |         57        0.57       99.29
          5 |         20        0.20       99.49
          6 |         16        0.16       99.65
          7 |          7        0.07       99.72
          8 |          9        0.09       99.81
          9 |          3        0.03       99.84
         11 |          1        0.01       99.85
         12 |          1        0.01       99.86
         13 |          2        0.02       99.88
         15 |          1        0.01       99.89
         17 |          1        0.01       99.90
         27 |          2        0.02       99.92
         29 |          1        0.01       99.93
         35 |          1        0.01       99.94
         40 |          1        0.01       99.95
         47 |          2        0.02       99.97
         56 |          1        0.01       99.98
         72 |          1        0.01       99.99
         82 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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