Frequencies for first 10,000 rows of vehicles variable in accident dataset :

   Vehicles |
Involved in |
   Accident |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,228       62.28       62.28
          2 |      3,290       32.90       95.18
          3 |        399        3.99       99.17
          4 |         65        0.65       99.82
          5 |         14        0.14       99.96
          7 |          1        0.01       99.97
          8 |          1        0.01       99.98
         13 |          1        0.01       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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