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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        533        5.33        5.33
          1 |        292        2.92        8.25
          2 |        142        1.42        9.67
          3 |        575        5.75       15.42
          4 |         72        0.72       16.14
          5 |         95        0.95       17.09
          6 |        473        4.73       21.82
          7 |        104        1.04       22.86
          8 |        110        1.10       23.96
          9 |        700        7.00       30.96
         10 |        182        1.82       32.78
         11 |        365        3.65       36.43
         12 |      5,328       53.28       89.71
         13 |        252        2.52       92.23
         14 |        240        2.40       94.63
         18 |         86        0.86       95.49
         99 |        451        4.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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