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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,814       18.14       18.14
          1 |      1,064       10.64       28.78
          2 |        170        1.70       30.48
          3 |        569        5.69       36.17
          4 |         66        0.66       36.83
          5 |         73        0.73       37.56
          6 |        351        3.51       41.07
          7 |        100        1.00       42.07
          8 |         62        0.62       42.69
          9 |        676        6.76       49.45
         10 |        171        1.71       51.16
         11 |        479        4.79       55.95
         12 |      3,966       39.66       95.61
         13 |        213        2.13       97.74
         14 |        142        1.42       99.16
         99 |         84        0.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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