Frequencies for nmimpair variable in nmimpair dataset :

  condition |
(impairment |
  ) at time |
   of crash |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,567       40.28       40.28
          1 |         12        0.19       40.47
          2 |         10        0.16       40.62
          3 |         19        0.30       40.92
          4 |         13        0.20       41.13
          5 |          7        0.11       41.24
          6 |          5        0.08       41.31
          7 |          6        0.09       41.41
          8 |         43        0.67       42.08
          9 |        695       10.91       52.99
         10 |         25        0.39       53.38
         96 |         45        0.71       54.09
         98 |      1,377       21.61       75.69
         99 |      1,549       24.31      100.00
------------+-----------------------------------
      Total |      6,373      100.00

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