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

 trafficway |
description |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         63        0.63        0.63
          1 |      4,835       48.35       48.98
          2 |      2,197       21.97       70.95
          3 |      1,735       17.35       88.30
          4 |         69        0.69       88.99
          5 |        830        8.30       97.29
          6 |        191        1.91       99.20
          8 |         33        0.33       99.53
          9 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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