Frequencies for first 10,000 rows of pct012k043 variable in sf12010860us30 dataset :

   40 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,750       87.50       87.50
          1 |        903        9.03       96.53
          2 |        226        2.26       98.79
          3 |         67        0.67       99.46
          4 |         26        0.26       99.72
          5 |          7        0.07       99.79
          6 |          4        0.04       99.83
          7 |          2        0.02       99.85
          8 |          2        0.02       99.87
          9 |          1        0.01       99.88
         11 |          1        0.01       99.89
         14 |          1        0.01       99.90
         21 |          1        0.01       99.91
         22 |          1        0.01       99.92
         23 |          1        0.01       99.93
         26 |          1        0.01       99.94
         35 |          1        0.01       99.95
         36 |          1        0.01       99.96
         47 |          1        0.01       99.97
         52 |          1        0.01       99.98
         56 |          1        0.01       99.99
         59 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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