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

   Vehicles |
Involved in |
   Accident |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,175       61.75       61.75
          2 |      3,362       33.62       95.37
          3 |        378        3.78       99.15
          4 |         60        0.60       99.75
          5 |         16        0.16       99.91
          6 |          3        0.03       99.94
          7 |          2        0.02       99.96
         11 |          1        0.01       99.97
         12 |          1        0.01       99.98
         24 |          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