Frequencies for first 10,000 rows of pct012c078 variable in sf12000860us18 dataset :

   75 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,682       96.82       96.82
          1 |        266        2.66       99.48
          2 |         33        0.33       99.81
          3 |          7        0.07       99.88
          4 |          6        0.06       99.94
          5 |          3        0.03       99.97
          9 |          1        0.01       99.98
         13 |          1        0.01       99.99
         21 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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