Frequencies for first 10,000 rows of impact2 variable in vehicle dataset :

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        652        6.52        6.52
          1 |        831        8.31       14.83
          2 |        153        1.53       16.36
          3 |        680        6.80       23.16
          4 |        106        1.06       24.22
          5 |        145        1.45       25.67
          6 |        275        2.75       28.42
          7 |        183        1.83       30.25
          8 |        175        1.75       32.00
          9 |        711        7.11       39.11
         10 |        159        1.59       40.70
         11 |        984        9.84       50.54
         12 |      4,241       42.41       92.95
         13 |        119        1.19       94.14
         14 |        389        3.89       98.03
         15 |         45        0.45       98.48
         16 |         33        0.33       98.81
         99 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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