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

    Traffic |
    Control |
     Device |
Functioning |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,524       65.24       65.24
          1 |          6        0.06       65.30
          2 |          4        0.04       65.34
          3 |      3,322       33.22       98.56
          8 |         43        0.43       98.99
          9 |        101        1.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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