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

    traffic |
    control |
     device |
functioning |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,780       77.80       77.80
          1 |          9        0.09       77.89
          2 |          5        0.05       77.94
          3 |      2,100       21.00       98.94
          8 |         33        0.33       99.27
          9 |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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