Frequencies for first 10,000 rows of pct012k078 variable in sf12000860us26 dataset :

   75 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,733       97.33       97.33
          1 |        224        2.24       99.57
          2 |         27        0.27       99.84
          3 |          4        0.04       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