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

      first |
    harmful |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        729        7.29        7.29
          2 |          2        0.02        7.31
          3 |          6        0.06        7.37
          5 |         34        0.34        7.71
          7 |          8        0.08        7.79
          8 |      1,437       14.37       22.16
          9 |        253        2.53       24.69
         10 |         21        0.21       24.90
         11 |         25        0.25       25.15
         12 |      5,180       51.80       76.95
         14 |         78        0.78       77.73
         15 |         56        0.56       78.29
         16 |          1        0.01       78.30
         17 |         27        0.27       78.57
         18 |         49        0.49       79.06
         19 |          6        0.06       79.12
         20 |          4        0.04       79.16
         21 |         16        0.16       79.32
         23 |         27        0.27       79.59
         24 |        177        1.77       81.36
         25 |         78        0.78       82.14
         26 |          5        0.05       82.19
         30 |        133        1.33       83.52
         31 |         41        0.41       83.93
         32 |         64        0.64       84.57
         33 |        377        3.77       88.34
         34 |        116        1.16       89.50
         35 |        149        1.49       90.99
         38 |         89        0.89       91.88
         39 |         37        0.37       92.25
         40 |          2        0.02       92.27
         41 |         28        0.28       92.55
         42 |        408        4.08       96.63
         43 |         54        0.54       97.17
         44 |          8        0.08       97.25
         45 |          3        0.03       97.28
         46 |         11        0.11       97.39
         48 |          1        0.01       97.40
         49 |          1        0.01       97.41
         50 |          1        0.01       97.42
         52 |         35        0.35       97.77
         53 |         41        0.41       98.18
         54 |         19        0.19       98.37
         57 |         14        0.14       98.51
         58 |         20        0.20       98.71
         59 |        104        1.04       99.75
         72 |          3        0.03       99.78
         73 |          4        0.04       99.82
         99 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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