Frequencies for vehicles variable in accident dataset :

   Vehicles |
Involved in |
   Accident |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        361       73.82       73.82
          2 |        110       22.49       96.32
          3 |         17        3.48       99.80
          5 |          1        0.20      100.00
------------+-----------------------------------
      Total |        489      100.00

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