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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        844        8.44        8.44
          1 |        647        6.47       14.91
          2 |        229        2.29       17.20
          3 |        766        7.66       24.86
          4 |         53        0.53       25.39
          5 |        113        1.13       26.52
          6 |        314        3.14       29.66
          7 |        157        1.57       31.23
          8 |         85        0.85       32.08
          9 |        734        7.34       39.42
         10 |        180        1.80       41.22
         11 |        691        6.91       48.13
         12 |      4,526       45.26       93.39
         13 |        243        2.43       95.82
         14 |        254        2.54       98.36
         99 |        164        1.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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