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

    RELATED |
   FACTOR 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,866       98.66       98.66
          2 |          1        0.01       98.67
          7 |          2        0.02       98.69
         14 |          1        0.01       98.70
         16 |          3        0.03       98.73
         19 |          1        0.01       98.74
         99 |        126        1.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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