Frequencies for first 10,000 rows of pct0030022 variable in sf12010880us15 dataset :

  (400-999) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,797       97.97       97.97
          1 |        133        1.33       99.30
          2 |         29        0.29       99.59
          3 |         18        0.18       99.77
          4 |         14        0.14       99.91
          5 |          3        0.03       99.94
          6 |          5        0.05       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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