Frequencies for impact2 variable in vehnit dataset :

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.09        0.09
          1 |         27        2.42        2.51
          2 |         14        1.25        3.76
          3 |         54        4.84        8.60
          4 |         19        1.70       10.30
          5 |         41        3.67       13.98
          6 |        407       36.47       50.45
          7 |        107        9.59       60.04
          8 |         42        3.76       63.80
          9 |         93        8.33       72.13
         10 |         35        3.14       75.27
         11 |         53        4.75       80.02
         12 |        161       14.43       94.44
         13 |         15        1.34       95.79
         14 |          5        0.45       96.24
         18 |          6        0.54       96.77
         99 |         36        3.23      100.00
------------+-----------------------------------
      Total |      1,116      100.00

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