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

   Vehicles |
Involved in |
   Accident |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,151       61.51       61.51
          2 |      3,341       33.41       94.92
          3 |        402        4.02       98.94
          4 |         76        0.76       99.70
          5 |         20        0.20       99.90
          6 |          4        0.04       99.94
          7 |          4        0.04       99.98
          9 |          1        0.01       99.99
         28 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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