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

relation to |
 trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,200       62.00       62.00
          2 |        132        1.32       63.32
          3 |        466        4.66       67.98
          4 |      2,724       27.24       95.22
          5 |        318        3.18       98.40
          6 |         19        0.19       98.59
          7 |         32        0.32       98.91
          8 |         49        0.49       99.40
         10 |          8        0.08       99.48
         11 |          3        0.03       99.51
         98 |          3        0.03       99.54
         99 |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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