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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        638        6.38        6.38
          1 |        844        8.44       14.82
          2 |        161        1.61       16.43
          3 |        698        6.98       23.41
          4 |         99        0.99       24.40
          5 |        148        1.48       25.88
          6 |        354        3.54       29.42
          7 |        161        1.61       31.03
          8 |        137        1.37       32.40
          9 |        734        7.34       39.74
         10 |        179        1.79       41.53
         11 |        937        9.37       50.90
         12 |      4,197       41.97       92.87
         13 |        119        1.19       94.06
         14 |        386        3.86       97.92
         15 |         31        0.31       98.23
         16 |         18        0.18       98.41
         99 |        159        1.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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