Frequencies for first 10,000 rows of pct012e018 variable in sf12000860us20 dataset :

   15 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,731       97.31       97.31
          1 |        235        2.35       99.66
          2 |         29        0.29       99.95
          3 |          3        0.03       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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