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

   Critical |
    Event - |
   Precrash |
    (Event) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         96        0.96        0.96
          2 |          1        0.01        0.97
          3 |          8        0.08        1.05
          4 |          3        0.03        1.08
          5 |         67        0.67        1.75
          6 |        455        4.55        6.30
          8 |         85        0.85        7.15
          9 |        152        1.52        8.67
         10 |        606        6.06       14.73
         11 |        112        1.12       15.85
         12 |        802        8.02       23.87
         13 |      1,147       11.47       35.34
         14 |         30        0.30       35.64
         15 |        441        4.41       40.05
         16 |         25        0.25       40.30
         17 |        484        4.84       45.14
         18 |          7        0.07       45.21
         19 |          9        0.09       45.30
         50 |        219        2.19       47.49
         51 |        288        2.88       50.37
         52 |         74        0.74       51.11
         53 |        533        5.33       56.44
         54 |        264        2.64       59.08
         55 |         67        0.67       59.75
         56 |         11        0.11       59.86
         59 |          4        0.04       59.90
         60 |        191        1.91       61.81
         61 |        144        1.44       63.25
         62 |      1,032       10.32       73.57
         63 |         25        0.25       73.82
         64 |         39        0.39       74.21
         65 |         31        0.31       74.52
         66 |        463        4.63       79.15
         67 |        124        1.24       80.39
         68 |         14        0.14       80.53
         70 |          8        0.08       80.61
         71 |         24        0.24       80.85
         72 |         28        0.28       81.13
         73 |          3        0.03       81.16
         74 |          6        0.06       81.22
         78 |         13        0.13       81.35
         80 |      1,241       12.41       93.76
         81 |          8        0.08       93.84
         82 |          7        0.07       93.91
         83 |        219        2.19       96.10
         84 |          3        0.03       96.13
         87 |         24        0.24       96.37
         88 |          1        0.01       96.38
         89 |          1        0.01       96.39
         90 |         42        0.42       96.81
         91 |          3        0.03       96.84
         92 |          1        0.01       96.85
         98 |        254        2.54       99.39
         99 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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