Frequencies for first 10,000 rows of pct012c028 variable in sf12000860us18 dataset :

   25 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,615       86.15       86.15
          1 |        882        8.82       94.97
          2 |        257        2.57       97.54
          3 |        121        1.21       98.75
          4 |         40        0.40       99.15
          5 |         22        0.22       99.37
          6 |         22        0.22       99.59
          7 |         12        0.12       99.71
          8 |          5        0.05       99.76
          9 |          4        0.04       99.80
         10 |          5        0.05       99.85
         11 |          2        0.02       99.87
         12 |          1        0.01       99.88
         13 |          1        0.01       99.89
         14 |          2        0.02       99.91
         16 |          1        0.01       99.92
         21 |          1        0.01       99.93
         29 |          1        0.01       99.94
         36 |          1        0.01       99.95
         39 |          1        0.01       99.96
         40 |          1        0.01       99.97
         63 |          1        0.01       99.98
         65 |          1        0.01       99.99
         71 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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