Frequencies for first 10,000 rows of pct012e016 variable in sf12000860us20 dataset :

   13 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,749       97.49       97.49
          1 |        217        2.17       99.66
          2 |         26        0.26       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017