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

      first |
    harmful |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        815        8.15        8.15
          2 |          6        0.06        8.21
          3 |          6        0.06        8.27
          5 |         49        0.49        8.76
          7 |          7        0.07        8.83
          8 |      1,363       13.63       22.46
          9 |        274        2.74       25.20
         10 |         18        0.18       25.38
         11 |         23        0.23       25.61
         12 |      5,130       51.30       76.91
         14 |        108        1.08       77.99
         15 |         49        0.49       78.48
         16 |          1        0.01       78.49
         17 |         32        0.32       78.81
         18 |         34        0.34       79.15
         19 |          9        0.09       79.24
         20 |         12        0.12       79.36
         21 |         17        0.17       79.53
         23 |         17        0.17       79.70
         24 |        154        1.54       81.24
         25 |         88        0.88       82.12
         26 |          6        0.06       82.18
         30 |        147        1.47       83.65
         31 |         71        0.71       84.36
         32 |         61        0.61       84.97
         33 |        338        3.38       88.35
         34 |        111        1.11       89.46
         35 |        185        1.85       91.31
         38 |        102        1.02       92.33
         39 |         36        0.36       92.69
         40 |          6        0.06       92.75
         41 |         19        0.19       92.94
         42 |        430        4.30       97.24
         43 |         67        0.67       97.91
         45 |          6        0.06       97.97
         46 |          9        0.09       98.06
         48 |          2        0.02       98.08
         49 |          2        0.02       98.10
         50 |          1        0.01       98.11
         51 |          2        0.02       98.13
         52 |         37        0.37       98.50
         53 |         31        0.31       98.81
         54 |         13        0.13       98.94
         58 |         22        0.22       99.16
         59 |         68        0.68       99.84
         72 |          2        0.02       99.86
         73 |          2        0.02       99.88
         99 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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