Frequencies for a_imp1 variable in veh_aux dataset :

     Intial |
     Impact |
      Point |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         37        5.61        5.61
          2 |        422       63.94       69.55
          3 |         70       10.61       80.15
          4 |         48        7.27       87.42
          5 |         83       12.58      100.00
------------+-----------------------------------
      Total |        660      100.00

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