Frequencies for first 10,000 rows of p_crash2 variable in vehicle dataset :

   critical |
    event - |
   precrash |
    (event) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         63        0.63        0.63
          2 |          1        0.01        0.64
          3 |          8        0.08        0.72
          4 |          5        0.05        0.77
          5 |         52        0.52        1.29
          6 |        456        4.56        5.85
          8 |         80        0.80        6.65
          9 |        196        1.96        8.61
         10 |        521        5.21       13.82
         11 |        123        1.23       15.05
         12 |        723        7.23       22.28
         13 |      1,066       10.66       32.94
         14 |         39        0.39       33.33
         15 |        506        5.06       38.39
         16 |         36        0.36       38.75
         17 |        470        4.70       43.45
         18 |          8        0.08       43.53
         19 |         16        0.16       43.69
         50 |        241        2.41       46.10
         51 |        251        2.51       48.61
         52 |         91        0.91       49.52
         53 |        551        5.51       55.03
         54 |        272        2.72       57.75
         55 |         16        0.16       57.91
         56 |          5        0.05       57.96
         59 |          1        0.01       57.97
         60 |        152        1.52       59.49
         61 |        177        1.77       61.26
         62 |      1,039       10.39       71.65
         63 |         33        0.33       71.98
         64 |         28        0.28       72.26
         65 |         26        0.26       72.52
         66 |        442        4.42       76.94
         67 |        110        1.10       78.04
         68 |          7        0.07       78.11
         70 |          5        0.05       78.16
         71 |         19        0.19       78.35
         72 |         29        0.29       78.64
         73 |          2        0.02       78.66
         74 |          3        0.03       78.69
         78 |          9        0.09       78.78
         80 |      1,320       13.20       91.98
         81 |          9        0.09       92.07
         82 |         13        0.13       92.20
         83 |        251        2.51       94.71
         84 |          8        0.08       94.79
         85 |          2        0.02       94.81
         87 |         30        0.30       95.11
         88 |          1        0.01       95.12
         90 |         65        0.65       95.77
         91 |          9        0.09       95.86
         92 |          1        0.01       95.87
         98 |        312        3.12       98.99
         99 |        101        1.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016