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

 trafficway |
description |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         52        0.52        0.52
          1 |      5,173       51.73       52.25
          2 |      2,156       21.56       73.81
          3 |      1,626       16.26       90.07
          4 |         61        0.61       90.68
          5 |        674        6.74       97.42
          6 |        194        1.94       99.36
          8 |          9        0.09       99.45
          9 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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