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

    traffic |
    control |
     device |
functioning |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,690       76.90       76.90
          1 |          5        0.05       76.95
          2 |          6        0.06       77.01
          3 |      2,221       22.21       99.22
          8 |         32        0.32       99.54
          9 |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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