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

      FIRST |
    HARMFUL |
      EVENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        940        9.40        9.40
          3 |          6        0.06        9.46
          5 |         48        0.48        9.94
          6 |          2        0.02        9.96
          7 |         24        0.24       10.20
          8 |        992        9.92       20.12
          9 |        160        1.60       21.72
         10 |         42        0.42       22.14
         11 |         28        0.28       22.42
         12 |      5,204       52.04       74.46
         13 |        265        2.65       77.11
         14 |         85        0.85       77.96
         15 |         18        0.18       78.14
         16 |          3        0.03       78.17
         17 |         28        0.28       78.45
         18 |         32        0.32       78.77
         19 |         12        0.12       78.89
         20 |          2        0.02       78.91
         21 |         11        0.11       79.02
         22 |          5        0.05       79.07
         23 |         26        0.26       79.33
         24 |        185        1.85       81.18
         25 |         85        0.85       82.03
         26 |         16        0.16       82.19
         27 |         99        0.99       83.18
         28 |          1        0.01       83.19
         29 |         19        0.19       83.38
         30 |        107        1.07       84.45
         31 |         72        0.72       85.17
         32 |         67        0.67       85.84
         33 |        404        4.04       89.88
         34 |        100        1.00       90.88
         35 |        125        1.25       92.13
         36 |         25        0.25       92.38
         37 |         25        0.25       92.63
         38 |        110        1.10       93.73
         39 |         22        0.22       93.95
         40 |          5        0.05       94.00
         41 |         41        0.41       94.41
         42 |        405        4.05       98.46
         43 |        111        1.11       99.57
         45 |         10        0.10       99.67
         46 |          9        0.09       99.76
         47 |          1        0.01       99.77
         48 |          4        0.04       99.81
         49 |          1        0.01       99.82
         99 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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