Frequencies for impact2 variable in vehnit dataset :

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          4        0.31        0.31
          1 |         30        2.36        2.67
          2 |         21        1.65        4.32
          3 |         62        4.87        9.20
          4 |         26        2.04       11.24
          5 |         50        3.93       15.17
          6 |        468       36.79       51.97
          7 |         81        6.37       58.33
          8 |         29        2.28       60.61
          9 |        136       10.69       71.31
         10 |         40        3.14       74.45
         11 |         57        4.48       78.93
         12 |        174       13.68       92.61
         13 |         24        1.89       94.50
         18 |          9        0.71       95.20
         99 |         61        4.80      100.00
------------+-----------------------------------
      Total |      1,272      100.00

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