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

    Traffic |
    Control |
     Device |
Functioning |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,701       77.01       77.01
          2 |          3        0.03       77.04
          3 |      2,199       21.99       99.03
          8 |         29        0.29       99.32
          9 |         68        0.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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