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

      FIRST |
    HARMFUL |
      EVENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        900        9.00        9.00
          2 |          1        0.01        9.01
          3 |          3        0.03        9.04
          5 |         43        0.43        9.47
          6 |          1        0.01        9.48
          7 |         24        0.24        9.72
          8 |      1,037       10.37       20.09
          9 |        153        1.53       21.62
         10 |         42        0.42       22.04
         11 |         23        0.23       22.27
         12 |      5,081       50.81       73.08
         13 |        324        3.24       76.32
         14 |        122        1.22       77.54
         15 |         23        0.23       77.77
         16 |          6        0.06       77.83
         17 |         31        0.31       78.14
         18 |         19        0.19       78.33
         19 |          8        0.08       78.41
         20 |          9        0.09       78.50
         21 |         15        0.15       78.65
         22 |          5        0.05       78.70
         23 |         46        0.46       79.16
         24 |        216        2.16       81.32
         25 |         96        0.96       82.28
         26 |          8        0.08       82.36
         27 |        112        1.12       83.48
         28 |          1        0.01       83.49
         29 |         23        0.23       83.72
         30 |        101        1.01       84.73
         31 |         69        0.69       85.42
         32 |         69        0.69       86.11
         33 |        383        3.83       89.94
         34 |        121        1.21       91.15
         35 |        135        1.35       92.50
         36 |         21        0.21       92.71
         37 |         40        0.40       93.11
         38 |        123        1.23       94.34
         39 |         20        0.20       94.54
         40 |          6        0.06       94.60
         41 |         38        0.38       94.98
         42 |        355        3.55       98.53
         43 |        107        1.07       99.60
         45 |          7        0.07       99.67
         46 |         10        0.10       99.77
         47 |          4        0.04       99.81
         48 |          2        0.02       99.83
         99 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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