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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        868        8.68        8.68
          2 |          4        0.04        8.72
          3 |         25        0.25        8.97
          4 |          1        0.01        8.98
          5 |         68        0.68        9.66
          7 |         21        0.21        9.87
          8 |      1,206       12.06       21.93
          9 |        164        1.64       23.57
         10 |        103        1.03       24.60
         11 |         16        0.16       24.76
         12 |      5,324       53.24       78.00
         13 |         68        0.68       78.68
         14 |        142        1.42       80.10
         16 |         27        0.27       80.37
         17 |        132        1.32       81.69
         18 |         26        0.26       81.95
         19 |        141        1.41       83.36
         20 |        268        2.68       86.04
         21 |         98        0.98       87.02
         22 |        210        2.10       89.12
         23 |         75        0.75       89.87
         24 |        200        2.00       91.87
         25 |         45        0.45       92.32
         26 |         50        0.50       92.82
         27 |        339        3.39       96.21
         28 |        210        2.10       98.31
         29 |         57        0.57       98.88
         31 |        107        1.07       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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