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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        240        2.40        2.40
          1 |        679        6.79        9.19
          2 |        189        1.89       11.08
          3 |        940        9.40       20.48
          4 |        114        1.14       21.62
          5 |        113        1.13       22.75
          6 |        339        3.39       26.14
          7 |        186        1.86       28.00
          8 |        121        1.21       29.21
          9 |        931        9.31       38.52
         10 |         88        0.88       39.40
         11 |        730        7.30       46.70
         12 |      4,031       40.31       87.01
         13 |      1,031       10.31       97.32
         14 |        151        1.51       98.83
         15 |         29        0.29       99.12
         99 |         88        0.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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