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

   Accident |
    Related |
   Factor 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,846       98.46       98.46
          2 |          1        0.01       98.47
          4 |          4        0.04       98.51
         15 |          1        0.01       98.52
         16 |          2        0.02       98.54
         17 |          1        0.01       98.55
         99 |        145        1.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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