Frequencies for first 10,000 rows of pct012n018 variable in sf12000860us29 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,022       90.22       90.22
          1 |        654        6.54       96.76
          2 |        169        1.69       98.45
          3 |         81        0.81       99.26
          4 |         22        0.22       99.48
          5 |         16        0.16       99.64
          6 |          6        0.06       99.70
          7 |          9        0.09       99.79
          8 |          6        0.06       99.85
          9 |          1        0.01       99.86
         10 |          2        0.02       99.88
         11 |          2        0.02       99.90
         13 |          1        0.01       99.91
         14 |          1        0.01       99.92
         15 |          1        0.01       99.93
         16 |          1        0.01       99.94
         25 |          1        0.01       99.95
         28 |          1        0.01       99.96
         30 |          1        0.01       99.97
         31 |          1        0.01       99.98
         34 |          1        0.01       99.99
         38 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017