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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        766        7.66        7.66
          2 |          4        0.04        7.70
          3 |          7        0.07        7.77
          5 |         65        0.65        8.42
          6 |          1        0.01        8.43
          7 |          3        0.03        8.46
          8 |        957        9.57       18.03
          9 |        131        1.31       19.34
         10 |         79        0.79       20.13
         11 |         14        0.14       20.27
         12 |      5,541       55.41       75.68
         13 |         88        0.88       76.56
         14 |        201        2.01       78.57
         15 |         10        0.10       78.67
         16 |         20        0.20       78.87
         18 |          7        0.07       78.94
         19 |        136        1.36       80.30
         20 |        424        4.24       84.54
         21 |         69        0.69       85.23
         22 |        310        3.10       88.33
         23 |         81        0.81       89.14
         24 |        200        2.00       91.14
         25 |         18        0.18       91.32
         26 |         42        0.42       91.74
         27 |        321        3.21       94.95
         28 |        221        2.21       97.16
         29 |         30        0.30       97.46
         30 |          1        0.01       97.47
         31 |        135        1.35       98.82
         32 |         38        0.38       99.20
         33 |         64        0.64       99.84
         99 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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