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

relation to |
 trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,076       60.76       60.76
          2 |        203        2.03       62.79
          3 |        419        4.19       66.98
          4 |      2,548       25.48       92.46
          5 |        591        5.91       98.37
          6 |         31        0.31       98.68
          7 |         23        0.23       98.91
          8 |         54        0.54       99.45
         10 |          4        0.04       99.49
         11 |         11        0.11       99.60
         98 |          1        0.01       99.61
         99 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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