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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        799        7.99        7.99
          1 |        905        9.05       17.04
          2 |        128        1.28       18.32
          3 |        689        6.89       25.21
          4 |         62        0.62       25.83
          5 |        134        1.34       27.17
          6 |        341        3.41       30.58
          7 |        161        1.61       32.19
          8 |        103        1.03       33.22
          9 |        710        7.10       40.32
         10 |        102        1.02       41.34
         11 |        919        9.19       50.53
         12 |      4,398       43.98       94.51
         13 |        138        1.38       95.89
         14 |        335        3.35       99.24
         15 |         30        0.30       99.54
         99 |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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