Frequencies for cf2 variable in accident dataset :

   Accident |
    Related |
   Factor 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        483       98.77       98.77
         22 |          1        0.20       98.98
         23 |          1        0.20       99.18
         24 |          1        0.20       99.39
         28 |          1        0.20       99.59
         45 |          1        0.20       99.80
         46 |          1        0.20      100.00
------------+-----------------------------------
      Total |        489      100.00

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