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

      FIRST |
    HARMFUL |
      EVENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        942        9.42        9.42
          2 |          2        0.02        9.44
          3 |          5        0.05        9.49
          5 |         40        0.40        9.89
          7 |         34        0.34       10.23
          8 |        960        9.60       19.83
          9 |        148        1.48       21.31
         10 |         33        0.33       21.64
         11 |         12        0.12       21.76
         12 |      5,415       54.15       75.91
         13 |        198        1.98       77.89
         14 |         93        0.93       78.82
         15 |         21        0.21       79.03
         16 |          6        0.06       79.09
         17 |         33        0.33       79.42
         18 |         40        0.40       79.82
         19 |          5        0.05       79.87
         20 |          2        0.02       79.89
         21 |         13        0.13       80.02
         22 |          4        0.04       80.06
         23 |         29        0.29       80.35
         24 |        176        1.76       82.11
         25 |         89        0.89       83.00
         26 |         14        0.14       83.14
         27 |         82        0.82       83.96
         28 |          4        0.04       84.00
         29 |         22        0.22       84.22
         30 |         92        0.92       85.14
         31 |         50        0.50       85.64
         32 |         70        0.70       86.34
         33 |        365        3.65       89.99
         34 |        109        1.09       91.08
         35 |        118        1.18       92.26
         36 |         26        0.26       92.52
         37 |         48        0.48       93.00
         38 |         97        0.97       93.97
         39 |         30        0.30       94.27
         40 |          3        0.03       94.30
         41 |         14        0.14       94.44
         42 |        410        4.10       98.54
         43 |         98        0.98       99.52
         44 |          2        0.02       99.54
         45 |          9        0.09       99.63
         46 |         12        0.12       99.75
         47 |          2        0.02       99.77
         48 |          2        0.02       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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