Frequencies for first 10,000 rows of vtrafway variable in vehicle dataset :

 trafficway |
description |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         75        0.75        0.75
          1 |      5,029       50.29       51.04
          2 |      1,982       19.82       70.86
          3 |      1,814       18.14       89.00
          4 |         89        0.89       89.89
          5 |        650        6.50       96.39
          6 |        219        2.19       98.58
          8 |         34        0.34       98.92
          9 |        108        1.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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