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

  Condition |
(Impairment |
  ) at Time |
   of Crash |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,048       60.48       60.48
          1 |         71        0.71       61.19
          2 |        141        1.41       62.60
          4 |          1        0.01       62.61
          5 |          1        0.01       62.62
          6 |          1        0.01       62.63
          8 |         22        0.22       62.85
          9 |      1,241       12.41       75.26
         10 |         40        0.40       75.66
         95 |         61        0.61       76.27
         96 |         25        0.25       76.52
         98 |        235        2.35       78.87
         99 |      2,113       21.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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