Frequencies for first 10,000 rows of pct013c008 variable in sf12010880us35 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,844       88.44       88.44
          1 |        710        7.10       95.54
          2 |        187        1.87       97.41
          3 |        108        1.08       98.49
          4 |         49        0.49       98.98
          5 |         32        0.32       99.30
          6 |         25        0.25       99.55
          7 |          6        0.06       99.61
          8 |         12        0.12       99.73
          9 |          7        0.07       99.80
         10 |          8        0.08       99.88
         11 |          1        0.01       99.89
         12 |          1        0.01       99.90
         13 |          1        0.01       99.91
         14 |          2        0.02       99.93
         15 |          2        0.02       99.95
         17 |          2        0.02       99.97
         19 |          2        0.02       99.99
         23 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017