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

    related |
factors (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,927       99.27       99.27
          4 |          1        0.01       99.28
         14 |         19        0.19       99.47
         15 |          5        0.05       99.52
         19 |          9        0.09       99.61
         20 |          6        0.06       99.67
         23 |         15        0.15       99.82
         26 |          1        0.01       99.83
         27 |          3        0.03       99.86
         28 |          3        0.03       99.89
         99 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016