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

    RELATED |
   FACTOR 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,937       99.37       99.37
          4 |          1        0.01       99.38
         14 |         16        0.16       99.54
         15 |          1        0.01       99.55
         18 |          1        0.01       99.56
         19 |          4        0.04       99.60
         20 |          1        0.01       99.61
         21 |          1        0.01       99.62
         99 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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