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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        766        7.66        7.66
          1 |        967        9.67       17.33
          2 |        140        1.40       18.73
          3 |        689        6.89       25.62
          4 |         50        0.50       26.12
          5 |        114        1.14       27.26
          6 |        353        3.53       30.79
          7 |        145        1.45       32.24
          8 |        114        1.14       33.38
          9 |        656        6.56       39.94
         10 |        159        1.59       41.53
         11 |      1,040       10.40       51.93
         12 |      4,242       42.42       94.35
         13 |         89        0.89       95.24
         14 |        347        3.47       98.71
         15 |         29        0.29       99.00
         16 |         13        0.13       99.13
         99 |         87        0.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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