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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        785        7.85        7.85
          1 |        719        7.19       15.04
          2 |        154        1.54       16.58
          3 |        711        7.11       23.69
          4 |        101        1.01       24.70
          5 |        117        1.17       25.87
          6 |        330        3.30       29.17
          7 |        147        1.47       30.64
          8 |        131        1.31       31.95
          9 |        800        8.00       39.95
         10 |        178        1.78       41.73
         11 |        836        8.36       50.09
         12 |      4,335       43.35       93.44
         13 |         88        0.88       94.32
         14 |        399        3.99       98.31
         15 |         37        0.37       98.68
         16 |         16        0.16       98.84
         99 |        116        1.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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