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

      FIRST |
    HARMFUL |
      EVENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        873        8.73        8.73
          2 |          1        0.01        8.74
          3 |          6        0.06        8.80
          5 |         31        0.31        9.11
          7 |         25        0.25        9.36
          8 |      1,033       10.33       19.69
          9 |        161        1.61       21.30
         10 |         47        0.47       21.77
         11 |         17        0.17       21.94
         12 |      5,322       53.22       75.16
         13 |        233        2.33       77.49
         14 |         96        0.96       78.45
         15 |         25        0.25       78.70
         16 |          7        0.07       78.77
         17 |         30        0.30       79.07
         18 |         25        0.25       79.32
         19 |          4        0.04       79.36
         20 |          5        0.05       79.41
         21 |         18        0.18       79.59
         22 |          6        0.06       79.65
         23 |         53        0.53       80.18
         24 |        185        1.85       82.03
         25 |        104        1.04       83.07
         26 |          7        0.07       83.14
         27 |         63        0.63       83.77
         29 |         17        0.17       83.94
         30 |        128        1.28       85.22
         31 |         76        0.76       85.98
         32 |         66        0.66       86.64
         33 |        320        3.20       89.84
         34 |        115        1.15       90.99
         35 |         99        0.99       91.98
         36 |         34        0.34       92.32
         37 |         56        0.56       92.88
         38 |        107        1.07       93.95
         39 |         22        0.22       94.17
         40 |          1        0.01       94.18
         41 |         40        0.40       94.58
         42 |        384        3.84       98.42
         43 |        111        1.11       99.53
         44 |          3        0.03       99.56
         45 |          6        0.06       99.62
         46 |         14        0.14       99.76
         47 |          4        0.04       99.80
         48 |          3        0.03       99.83
         99 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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