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

relation to |
 trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,378       63.78       63.78
          2 |        142        1.42       65.20
          3 |        428        4.28       69.48
          4 |      2,708       27.08       96.56
          5 |        192        1.92       98.48
          6 |         17        0.17       98.65
          7 |         23        0.23       98.88
          8 |         60        0.60       99.48
         10 |          5        0.05       99.53
         11 |          5        0.05       99.58
         98 |          2        0.02       99.60
         99 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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