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

   Vehicles |
Involved in |
   Accident |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,015       60.15       60.15
          2 |      3,459       34.59       94.74
          3 |        431        4.31       99.05
          4 |         70        0.70       99.75
          5 |         15        0.15       99.90
          6 |          4        0.04       99.94
          7 |          2        0.02       99.96
          9 |          2        0.02       99.98
         15 |          1        0.01       99.99
         18 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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