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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        758        7.58        7.58
          1 |        739        7.39       14.97
          2 |        143        1.43       16.40
          3 |        652        6.52       22.92
          4 |        110        1.10       24.02
          5 |        138        1.38       25.40
          6 |        394        3.94       29.34
          7 |        144        1.44       30.78
          8 |        158        1.58       32.36
          9 |        756        7.56       39.92
         10 |        227        2.27       42.19
         11 |        854        8.54       50.73
         12 |      4,258       42.58       93.31
         13 |        106        1.06       94.37
         14 |        387        3.87       98.24
         15 |         34        0.34       98.58
         16 |         18        0.18       98.76
         99 |        124        1.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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