Frequencies for first 10,000 rows of pct012e009 variable in sf12010880us24 dataset :

    6 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,813       98.13       98.13
          1 |        168        1.68       99.81
          2 |         18        0.18       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017