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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        692        6.92        6.92
          1 |        760        7.60       14.52
          2 |        193        1.93       16.45
          3 |        712        7.12       23.57
          4 |        117        1.17       24.74
          5 |        138        1.38       26.12
          6 |        314        3.14       29.26
          7 |        137        1.37       30.63
          8 |        152        1.52       32.15
          9 |        788        7.88       40.03
         10 |        210        2.10       42.13
         11 |        845        8.45       50.58
         12 |      4,162       41.62       92.20
         13 |        108        1.08       93.28
         14 |        472        4.72       98.00
         15 |         40        0.40       98.40
         16 |         15        0.15       98.55
         99 |        145        1.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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