Frequencies for first 10,000 rows of pct012m170 variable in sf12000860us28 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,947       99.47       99.47
          1 |         52        0.52       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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