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

    traffic |
    control |
     device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,758       77.58       77.58
          1 |         48        0.48       78.06
          2 |        472        4.72       82.78
          3 |        661        6.61       89.39
          4 |         28        0.28       89.67
          7 |          1        0.01       89.68
          8 |          4        0.04       89.72
         20 |        484        4.84       94.56
         21 |         18        0.18       94.74
         23 |          5        0.05       94.79
         28 |        205        2.05       96.84
         29 |          3        0.03       96.87
         40 |        204        2.04       98.91
         50 |         16        0.16       99.07
         65 |         30        0.30       99.37
         97 |         18        0.18       99.55
         98 |         10        0.10       99.65
         99 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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