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

      first |
    harmful |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        871        8.71        8.71
          2 |          2        0.02        8.73
          3 |         11        0.11        8.84
          4 |          2        0.02        8.86
          5 |         57        0.57        9.43
          7 |          6        0.06        9.49
          8 |      1,305       13.05       22.54
          9 |        252        2.52       25.06
         10 |         18        0.18       25.24
         11 |         33        0.33       25.57
         12 |      5,092       50.92       76.49
         14 |        105        1.05       77.54
         15 |         65        0.65       78.19
         16 |          3        0.03       78.22
         17 |         29        0.29       78.51
         18 |         37        0.37       78.88
         19 |          9        0.09       78.97
         20 |          6        0.06       79.03
         21 |         17        0.17       79.20
         23 |         20        0.20       79.40
         24 |        165        1.65       81.05
         25 |         99        0.99       82.04
         26 |          1        0.01       82.05
         30 |        152        1.52       83.57
         31 |         78        0.78       84.35
         32 |         67        0.67       85.02
         33 |        269        2.69       87.71
         34 |        102        1.02       88.73
         35 |        164        1.64       90.37
         38 |         97        0.97       91.34
         39 |         31        0.31       91.65
         40 |          3        0.03       91.68
         41 |         14        0.14       91.82
         42 |        479        4.79       96.61
         43 |         86        0.86       97.47
         44 |          4        0.04       97.51
         45 |          1        0.01       97.52
         46 |         15        0.15       97.67
         48 |          1        0.01       97.68
         51 |          2        0.02       97.70
         52 |         28        0.28       97.98
         53 |         40        0.40       98.38
         54 |         20        0.20       98.58
         57 |          5        0.05       98.63
         58 |         27        0.27       98.90
         59 |         95        0.95       99.85
         72 |          3        0.03       99.88
         99 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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