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

    related |
factors (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,953       99.53       99.53
         13 |          1        0.01       99.54
         14 |          3        0.03       99.57
         15 |          2        0.02       99.59
         19 |          4        0.04       99.63
         20 |          3        0.03       99.66
         21 |          1        0.01       99.67
         23 |         18        0.18       99.85
         24 |          1        0.01       99.86
         99 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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