Frequencies for first 10,000 rows of cf3 variable in accident dataset :

    RELATED |
   FACTOR 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,905       99.05       99.05
          5 |          1        0.01       99.06
         15 |          3        0.03       99.09
         19 |          2        0.02       99.11
         99 |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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