Frequencies for first 10,000 rows of pct012k021 variable in sf12010860us30 dataset :

   18 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,709       87.09       87.09
          1 |        914        9.14       96.23
          2 |        224        2.24       98.47
          3 |         62        0.62       99.09
          4 |         43        0.43       99.52
          5 |         13        0.13       99.65
          6 |          2        0.02       99.67
          7 |          9        0.09       99.76
          8 |          1        0.01       99.77
          9 |          4        0.04       99.81
         10 |          4        0.04       99.85
         11 |          2        0.02       99.87
         14 |          1        0.01       99.88
         17 |          1        0.01       99.89
         26 |          1        0.01       99.90
         27 |          1        0.01       99.91
         36 |          1        0.01       99.92
         38 |          2        0.02       99.94
         45 |          1        0.01       99.95
         51 |          1        0.01       99.96
         62 |          1        0.01       99.97
         71 |          1        0.01       99.98
         81 |          1        0.01       99.99
         89 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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