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

   Accident |
    Related |
   Factor 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,724       97.24       97.24
          2 |          1        0.01       97.25
          3 |          1        0.01       97.26
          5 |          1        0.01       97.27
          6 |          1        0.01       97.28
          7 |          1        0.01       97.29
         99 |        271        2.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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