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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        658        6.58        6.58
          1 |        584        5.84       12.42
          2 |        212        2.12       14.54
          3 |        632        6.32       20.86
          4 |        101        1.01       21.87
          5 |        123        1.23       23.10
          6 |        376        3.76       26.86
          7 |        149        1.49       28.35
          8 |        145        1.45       29.80
          9 |        783        7.83       37.63
         10 |        219        2.19       39.82
         11 |        670        6.70       46.52
         12 |      4,660       46.60       93.12
         13 |        102        1.02       94.14
         14 |        383        3.83       97.97
         15 |         38        0.38       98.35
         16 |         21        0.21       98.56
         99 |        144        1.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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