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

   critical |
    event - |
   precrash |
    (event) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         55        0.55        0.55
          2 |          1        0.01        0.56
          3 |         10        0.10        0.66
          5 |         40        0.40        1.06
          6 |        377        3.77        4.83
          8 |        175        1.75        6.58
          9 |        144        1.44        8.02
         10 |        588        5.88       13.90
         11 |        138        1.38       15.28
         12 |        698        6.98       22.26
         13 |      1,171       11.71       33.97
         14 |         34        0.34       34.31
         15 |        517        5.17       39.48
         16 |         21        0.21       39.69
         17 |        475        4.75       44.44
         18 |          8        0.08       44.52
         19 |         15        0.15       44.67
         50 |        269        2.69       47.36
         51 |        207        2.07       49.43
         52 |         76        0.76       50.19
         53 |        561        5.61       55.80
         54 |        254        2.54       58.34
         55 |         20        0.20       58.54
         56 |         11        0.11       58.65
         59 |          8        0.08       58.73
         60 |        172        1.72       60.45
         61 |        130        1.30       61.75
         62 |      1,072       10.72       72.47
         63 |         22        0.22       72.69
         64 |         33        0.33       73.02
         65 |         17        0.17       73.19
         66 |        415        4.15       77.34
         67 |        112        1.12       78.46
         68 |         17        0.17       78.63
         70 |          8        0.08       78.71
         71 |         18        0.18       78.89
         72 |         32        0.32       79.21
         73 |          4        0.04       79.25
         74 |          1        0.01       79.26
         78 |         13        0.13       79.39
         80 |      1,254       12.54       91.93
         81 |          9        0.09       92.02
         82 |         19        0.19       92.21
         83 |        262        2.62       94.83
         84 |          6        0.06       94.89
         85 |          2        0.02       94.91
         87 |         36        0.36       95.27
         88 |          2        0.02       95.29
         89 |          3        0.03       95.32
         90 |         51        0.51       95.83
         91 |          6        0.06       95.89
         92 |          2        0.02       95.91
         98 |        342        3.42       99.33
         99 |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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