Frequencies for harm_ev variable in vehicle dataset :

      FIRST |
    HARMFUL |
      EVENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          6        0.84        0.84
          3 |          1        0.14        0.98
          5 |          8        1.12        2.09
          7 |         17        2.37        4.47
          8 |        184       25.70       30.17
          9 |         22        3.07       33.24
         11 |          1        0.14       33.38
         12 |        336       46.93       80.31
         14 |          8        1.12       81.42
         15 |          3        0.42       81.84
         22 |          3        0.42       82.26
         25 |         27        3.77       86.03
         30 |         34        4.75       90.78
         35 |          8        1.12       91.90
         36 |          2        0.28       92.18
         37 |          2        0.28       92.46
         38 |          3        0.42       92.88
         39 |          9        1.26       94.13
         42 |         32        4.47       98.60
         43 |         10        1.40      100.00
------------+-----------------------------------
      Total |        716      100.00

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