Frequencies for first 10,000 rows of spec_use variable in vehicle dataset :

special use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,900       99.00       99.00
          1 |          7        0.07       99.07
          2 |         18        0.18       99.25
          3 |         37        0.37       99.62
          5 |          9        0.09       99.71
          6 |          4        0.04       99.75
          7 |          2        0.02       99.77
          8 |          1        0.01       99.78
         13 |          1        0.01       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016