Frequencies for first 10,000 rows of pct012m122 variable in sf12000860us28 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,816       98.16       98.16
          1 |        167        1.67       99.83
          2 |         13        0.13       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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