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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        905        9.05        9.05
          2 |          8        0.08        9.13
          3 |          9        0.09        9.22
          4 |          3        0.03        9.25
          5 |         63        0.63        9.88
          6 |          1        0.01        9.89
          7 |          4        0.04        9.93
          8 |      1,042       10.42       20.35
          9 |        149        1.49       21.84
         10 |         62        0.62       22.46
         11 |         13        0.13       22.59
         12 |      5,319       53.19       75.78
         13 |         64        0.64       76.42
         14 |        178        1.78       78.20
         15 |          7        0.07       78.27
         16 |         30        0.30       78.57
         18 |         10        0.10       78.67
         19 |        136        1.36       80.03
         20 |        483        4.83       84.86
         21 |        102        1.02       85.88
         22 |        243        2.43       88.31
         23 |         83        0.83       89.14
         24 |        188        1.88       91.02
         25 |         50        0.50       91.52
         26 |         56        0.56       92.08
         27 |        312        3.12       95.20
         28 |        173        1.73       96.93
         29 |         38        0.38       97.31
         31 |        153        1.53       98.84
         32 |         33        0.33       99.17
         33 |         75        0.75       99.92
         99 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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