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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        256        2.56        2.56
          1 |        466        4.66        7.22
          2 |        205        2.05        9.27
          3 |        896        8.96       18.23
          4 |         97        0.97       19.20
          5 |        143        1.43       20.63
          6 |        336        3.36       23.99
          7 |        188        1.88       25.87
          8 |        129        1.29       27.16
          9 |        895        8.95       36.11
         10 |        122        1.22       37.33
         11 |        636        6.36       43.69
         12 |      4,249       42.49       86.18
         13 |      1,054       10.54       96.72
         14 |        221        2.21       98.93
         15 |         14        0.14       99.07
         99 |         93        0.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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