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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        764        7.64        7.64
          1 |        776        7.76       15.40
          2 |        123        1.23       16.63
          3 |        759        7.59       24.22
          4 |         77        0.77       24.99
          5 |         95        0.95       25.94
          6 |        315        3.15       29.09
          7 |        141        1.41       30.50
          8 |        115        1.15       31.65
          9 |        834        8.34       39.99
         10 |        105        1.05       41.04
         11 |        739        7.39       48.43
         12 |      4,408       44.08       92.51
         13 |        465        4.65       97.16
         14 |        238        2.38       99.54
         15 |         15        0.15       99.69
         99 |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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