Frequencies for first 10,000 rows of cf2 variable in accident dataset :

   Accident |
    Related |
   Factor 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,796       97.96       97.96
          1 |          2        0.02       97.98
          3 |          1        0.01       97.99
          4 |          1        0.01       98.00
          5 |          1        0.01       98.01
          6 |          5        0.05       98.06
          7 |          3        0.03       98.09
         99 |        191        1.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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