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

 Trafficway |
Description |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         11        0.11        0.11
          1 |      5,190       51.90       52.01
          2 |      2,319       23.19       75.20
          3 |      1,454       14.54       89.74
          4 |         58        0.58       90.32
          5 |        659        6.59       96.91
          6 |        166        1.66       98.57
          8 |         18        0.18       98.75
          9 |        125        1.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016