Frequencies for impacts variable in vehnit dataset :

    VEHICLE |
       ROLE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          7        0.53        0.53
          2 |      1,234       92.92       93.45
          3 |         87        6.55      100.00
------------+-----------------------------------
      Total |      1,328      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016