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

 trafficway |
description |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         72        0.72        0.72
          1 |      4,953       49.53       50.25
          2 |      1,866       18.66       68.91
          3 |      1,991       19.91       88.82
          4 |         67        0.67       89.49
          5 |        687        6.87       96.36
          6 |        192        1.92       98.28
          8 |         85        0.85       99.13
          9 |         87        0.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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