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

   Vehicles |
Involved in |
   Accident |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,935       59.35       59.35
          2 |      3,359       33.59       92.94
          3 |        418        4.18       97.12
          4 |         87        0.87       97.99
          5 |         17        0.17       98.16
          6 |          4        0.04       98.20
          7 |          3        0.03       98.23
          8 |          2        0.02       98.25
         10 |          1        0.01       98.26
         32 |          1        0.01       98.27
         99 |        173        1.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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