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

    RELATED |
   FACTOR 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,872       98.72       98.72
          4 |          1        0.01       98.73
          7 |          1        0.01       98.74
         14 |          5        0.05       98.79
         15 |          5        0.05       98.84
         19 |         11        0.11       98.95
         99 |        105        1.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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