Frequencies for first 10,000 rows of impact1 variable in vehicle dataset :

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,814       18.14       18.14
          1 |      1,179       11.79       29.93
          2 |        171        1.71       31.64
          3 |        510        5.10       36.74
          4 |         55        0.55       37.29
          5 |         75        0.75       38.04
          6 |        352        3.52       41.56
          7 |         96        0.96       42.52
          8 |         51        0.51       43.03
          9 |        584        5.84       48.87
         10 |        170        1.70       50.57
         11 |        583        5.83       56.40
         12 |      4,032       40.32       96.72
         13 |         33        0.33       97.05
         14 |        214        2.14       99.19
         99 |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016