Frequencies for first 10,000 rows of pct013e032 variable in sf12000860us31 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,720       97.20       97.20
          1 |        232        2.32       99.52
          2 |         38        0.38       99.90
          3 |          6        0.06       99.96
          4 |          3        0.03       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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