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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        997        9.97        9.97
          2 |          2        0.02        9.99
          3 |          2        0.02       10.01
          5 |         52        0.52       10.53
          7 |          7        0.07       10.60
          8 |      1,259       12.59       23.19
          9 |        178        1.78       24.97
         10 |         62        0.62       25.59
         11 |         21        0.21       25.80
         12 |      5,162       51.62       77.42
         13 |        262        2.62       80.04
         14 |        158        1.58       81.62
         15 |         23        0.23       81.85
         16 |          2        0.02       81.87
         17 |         35        0.35       82.22
         18 |         36        0.36       82.58
         19 |          7        0.07       82.65
         20 |          2        0.02       82.67
         21 |         25        0.25       82.92
         22 |         25        0.25       83.17
         23 |         43        0.43       83.60
         24 |        162        1.62       85.22
         25 |         60        0.60       85.82
         26 |         16        0.16       85.98
         27 |         79        0.79       86.77
         28 |          1        0.01       86.78
         29 |         44        0.44       87.22
         30 |        128        1.28       88.50
         31 |         33        0.33       88.83
         32 |         66        0.66       89.49
         33 |        187        1.87       91.36
         34 |         98        0.98       92.34
         35 |         94        0.94       93.28
         36 |         28        0.28       93.56
         37 |         46        0.46       94.02
         38 |         95        0.95       94.97
         39 |         37        0.37       95.34
         40 |          7        0.07       95.41
         41 |         24        0.24       95.65
         42 |        309        3.09       98.74
         43 |        122        1.22       99.96
         44 |          1        0.01       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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