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

   critical |
    event - |
   precrash |
    (event) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         54        0.54        0.54
          2 |          1        0.01        0.55
          3 |         10        0.10        0.65
          5 |         40        0.40        1.05
          6 |        402        4.02        5.07
          8 |        163        1.63        6.70
          9 |        147        1.47        8.17
         10 |        585        5.85       14.02
         11 |        138        1.38       15.40
         12 |        684        6.84       22.24
         13 |      1,162       11.62       33.86
         14 |         34        0.34       34.20
         15 |        515        5.15       39.35
         16 |         21        0.21       39.56
         17 |        471        4.71       44.27
         18 |          8        0.08       44.35
         19 |         15        0.15       44.50
         50 |        276        2.76       47.26
         51 |        208        2.08       49.34
         52 |         76        0.76       50.10
         53 |        556        5.56       55.66
         54 |        247        2.47       58.13
         55 |         23        0.23       58.36
         56 |         12        0.12       58.48
         59 |          8        0.08       58.56
         60 |        172        1.72       60.28
         61 |        133        1.33       61.61
         62 |      1,059       10.59       72.20
         63 |         23        0.23       72.43
         64 |         34        0.34       72.77
         65 |         18        0.18       72.95
         66 |        420        4.20       77.15
         67 |        106        1.06       78.21
         68 |         17        0.17       78.38
         70 |          8        0.08       78.46
         71 |         20        0.20       78.66
         72 |         33        0.33       78.99
         73 |          4        0.04       79.03
         74 |          2        0.02       79.05
         78 |         13        0.13       79.18
         80 |      1,269       12.69       91.87
         81 |          9        0.09       91.96
         82 |         19        0.19       92.15
         83 |        264        2.64       94.79
         84 |          6        0.06       94.85
         85 |          2        0.02       94.87
         87 |         38        0.38       95.25
         88 |          2        0.02       95.27
         89 |          3        0.03       95.30
         90 |         51        0.51       95.81
         91 |          6        0.06       95.87
         92 |          2        0.02       95.89
         98 |        344        3.44       99.33
         99 |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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