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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        861        8.61        8.61
          2 |          2        0.02        8.63
          3 |         14        0.14        8.77
          5 |         64        0.64        9.41
          6 |          2        0.02        9.43
          7 |          2        0.02        9.45
          8 |      1,027       10.27       19.72
          9 |        105        1.05       20.77
         10 |         66        0.66       21.43
         11 |         19        0.19       21.62
         12 |      5,564       55.64       77.26
         13 |         79        0.79       78.05
         14 |        202        2.02       80.07
         15 |          9        0.09       80.16
         16 |         15        0.15       80.31
         17 |        108        1.08       81.39
         18 |         13        0.13       81.52
         19 |        132        1.32       82.84
         20 |        369        3.69       86.53
         21 |         63        0.63       87.16
         22 |        288        2.88       90.04
         23 |         66        0.66       90.70
         24 |        180        1.80       92.50
         25 |         30        0.30       92.80
         26 |         44        0.44       93.24
         27 |        313        3.13       96.37
         28 |        196        1.96       98.33
         29 |         46        0.46       98.79
         31 |        107        1.07       99.86
         99 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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