Frequencies for impact1 variable in vehnit dataset :

    INITIAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.09        0.09
          1 |         29        2.60        2.69
          2 |         16        1.43        4.12
          3 |         47        4.21        8.33
          4 |         18        1.61        9.95
          5 |         42        3.76       13.71
          6 |        427       38.26       51.97
          7 |        108        9.68       61.65
          8 |         36        3.23       64.87
          9 |         93        8.33       73.21
         10 |         31        2.78       75.99
         11 |         60        5.38       81.36
         12 |        153       13.71       95.07
         13 |         13        1.16       96.24
         14 |          6        0.54       96.77
         18 |          3        0.27       97.04
         99 |         33        2.96      100.00
------------+-----------------------------------
      Total |      1,116      100.00

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