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

      first |
    harmful |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        718        7.18        7.18
          2 |          3        0.03        7.21
          3 |          7        0.07        7.28
          5 |         32        0.32        7.60
          7 |          5        0.05        7.65
          8 |      1,388       13.88       21.53
          9 |        224        2.24       23.77
         10 |         15        0.15       23.92
         11 |         19        0.19       24.11
         12 |      5,420       54.20       78.31
         14 |         81        0.81       79.12
         15 |         50        0.50       79.62
         16 |          1        0.01       79.63
         17 |         31        0.31       79.94
         18 |         32        0.32       80.26
         19 |          9        0.09       80.35
         20 |         10        0.10       80.45
         21 |         18        0.18       80.63
         23 |         15        0.15       80.78
         24 |        165        1.65       82.43
         25 |         62        0.62       83.05
         26 |          4        0.04       83.09
         30 |        105        1.05       84.14
         31 |         55        0.55       84.69
         32 |         57        0.57       85.26
         33 |        404        4.04       89.30
         34 |         83        0.83       90.13
         35 |        168        1.68       91.81
         38 |         84        0.84       92.65
         39 |         24        0.24       92.89
         40 |          2        0.02       92.91
         41 |         15        0.15       93.06
         42 |        376        3.76       96.82
         43 |         69        0.69       97.51
         44 |          3        0.03       97.54
         45 |          1        0.01       97.55
         46 |          9        0.09       97.64
         48 |          3        0.03       97.67
         50 |          2        0.02       97.69
         51 |          3        0.03       97.72
         52 |         33        0.33       98.05
         53 |         30        0.30       98.35
         54 |          9        0.09       98.44
         57 |         15        0.15       98.59
         58 |         14        0.14       98.73
         59 |        106        1.06       99.79
         72 |          2        0.02       99.81
         73 |          2        0.02       99.83
         99 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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