Frequencies for first 10,000 rows of weather2 variable in accident dataset :

   weather2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,975       99.75       99.75
          1 |         16        0.16       99.91
          3 |          2        0.02       99.93
          4 |          2        0.02       99.95
          5 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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