Frequencies for first 10,000 rows of pct012k038 variable in sf12010860us30 dataset :

   35 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,024       90.24       90.24
          1 |        711        7.11       97.35
          2 |        162        1.62       98.97
          3 |         54        0.54       99.51
          4 |         18        0.18       99.69
          5 |          7        0.07       99.76
          6 |          4        0.04       99.80
          7 |          5        0.05       99.85
          8 |          2        0.02       99.87
         11 |          1        0.01       99.88
         12 |          1        0.01       99.89
         13 |          1        0.01       99.90
         14 |          1        0.01       99.91
         17 |          1        0.01       99.92
         19 |          1        0.01       99.93
         25 |          1        0.01       99.94
         35 |          1        0.01       99.95
         37 |          1        0.01       99.96
         40 |          1        0.01       99.97
         53 |          1        0.01       99.98
         63 |          1        0.01       99.99
         66 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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