Frequencies for first 10,000 rows of pct0030020 variable in sf12010880us15 dataset :

  (400-999) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,882       98.82       98.82
          1 |         74        0.74       99.56
          2 |         21        0.21       99.77
          3 |         14        0.14       99.91
          4 |          4        0.04       99.95
          5 |          4        0.04       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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