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

    traffic |
    control |
     device |
functioning |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,758       77.58       77.58
          1 |          4        0.04       77.62
          2 |          2        0.02       77.64
          3 |      2,182       21.82       99.46
          8 |         19        0.19       99.65
          9 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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