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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        735        7.35        7.35
          1 |        818        8.18       15.53
          2 |        151        1.51       17.04
          3 |        717        7.17       24.21
          4 |         90        0.90       25.11
          5 |        135        1.35       26.46
          6 |        359        3.59       30.05
          7 |        165        1.65       31.70
          8 |        127        1.27       32.97
          9 |        760        7.60       40.57
         10 |        185        1.85       42.42
         11 |        809        8.09       50.51
         12 |      4,248       42.48       92.99
         13 |        118        1.18       94.17
         14 |        390        3.90       98.07
         15 |         38        0.38       98.45
         16 |         19        0.19       98.64
         99 |        136        1.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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