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

    RELATED |
   FACTOR 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,957       99.57       99.57
          3 |          1        0.01       99.58
          4 |          2        0.02       99.60
         14 |          5        0.05       99.65
         16 |          4        0.04       99.69
         19 |          4        0.04       99.73
         99 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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