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

Special Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,934       99.34       99.34
          1 |          5        0.05       99.39
          2 |          2        0.02       99.41
          3 |          2        0.02       99.43
          4 |          3        0.03       99.46
          5 |         21        0.21       99.67
          6 |          2        0.02       99.69
          7 |          1        0.01       99.70
          9 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016