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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        971        9.71        9.71
          2 |          1        0.01        9.72
          3 |         12        0.12        9.84
          5 |         44        0.44       10.28
          7 |         50        0.50       10.78
          8 |      1,125       11.25       22.03
          9 |        164        1.64       23.67
         10 |         68        0.68       24.35
         11 |         34        0.34       24.69
         12 |      5,081       50.81       75.50
         13 |        295        2.95       78.45
         14 |        178        1.78       80.23
         15 |         14        0.14       80.37
         16 |          1        0.01       80.38
         17 |         40        0.40       80.78
         18 |         31        0.31       81.09
         19 |         10        0.10       81.19
         20 |          5        0.05       81.24
         21 |         28        0.28       81.52
         22 |         21        0.21       81.73
         23 |         31        0.31       82.04
         24 |        177        1.77       83.81
         25 |         63        0.63       84.44
         26 |         12        0.12       84.56
         27 |         81        0.81       85.37
         29 |         44        0.44       85.81
         30 |        148        1.48       87.29
         31 |         41        0.41       87.70
         32 |         51        0.51       88.21
         33 |        227        2.27       90.48
         34 |        105        1.05       91.53
         35 |        112        1.12       92.65
         36 |         28        0.28       92.93
         37 |         45        0.45       93.38
         38 |         90        0.90       94.28
         39 |         26        0.26       94.54
         40 |          4        0.04       94.58
         41 |         49        0.49       95.07
         42 |        367        3.67       98.74
         43 |        123        1.23       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016