Frequencies for first 10,000 rows of pct0030019 variable in sf12010880us15 dataset :

  (400-999) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,718       97.18       97.18
          1 |        173        1.73       98.91
          2 |         53        0.53       99.44
          3 |         35        0.35       99.79
          4 |          8        0.08       99.87
          5 |         10        0.10       99.97
          6 |          1        0.01       99.98
          7 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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