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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        532        5.32        5.32
          1 |        321        3.21        8.53
          2 |        142        1.42        9.95
          3 |        552        5.52       15.47
          4 |         93        0.93       16.40
          5 |         88        0.88       17.28
          6 |        543        5.43       22.71
          7 |        108        1.08       23.79
          8 |        108        1.08       24.87
          9 |        673        6.73       31.60
         10 |        134        1.34       32.94
         11 |        391        3.91       36.85
         12 |      5,301       53.01       89.86
         13 |        126        1.26       91.12
         14 |        230        2.30       93.42
         18 |         71        0.71       94.13
         99 |        587        5.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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