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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,045       10.45       10.45
          2 |          3        0.03       10.48
          3 |          7        0.07       10.55
          5 |         56        0.56       11.11
          7 |          5        0.05       11.16
          8 |      1,127       11.27       22.43
          9 |        173        1.73       24.16
         10 |         46        0.46       24.62
         11 |         15        0.15       24.77
         12 |      5,049       50.49       75.26
         13 |        331        3.31       78.57
         14 |        168        1.68       80.25
         15 |         15        0.15       80.40
         16 |          3        0.03       80.43
         17 |         38        0.38       80.81
         18 |         26        0.26       81.07
         19 |         11        0.11       81.18
         20 |          3        0.03       81.21
         21 |         24        0.24       81.45
         22 |         35        0.35       81.80
         23 |         33        0.33       82.13
         24 |        144        1.44       83.57
         25 |         64        0.64       84.21
         26 |         13        0.13       84.34
         27 |         79        0.79       85.13
         29 |         40        0.40       85.53
         30 |        148        1.48       87.01
         31 |         44        0.44       87.45
         32 |         69        0.69       88.14
         33 |        196        1.96       90.10
         34 |        120        1.20       91.30
         35 |        103        1.03       92.33
         36 |         31        0.31       92.64
         37 |         64        0.64       93.28
         38 |        107        1.07       94.35
         39 |         31        0.31       94.66
         40 |          9        0.09       94.75
         41 |         26        0.26       95.01
         42 |        348        3.48       98.49
         43 |        150        1.50       99.99
         44 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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