Frequencies for first 10,000 rows of PCT012B101 variable in sf12000860us17 dataset :

   98 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,766       97.66       97.66
          1 |        190        1.90       99.56
          2 |         35        0.35       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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