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

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,524       65.24       65.24
          1 |         52        0.52       65.76
          2 |        448        4.48       70.24
          3 |        741        7.41       77.65
          4 |         24        0.24       77.89
          7 |          1        0.01       77.90
          8 |          4        0.04       77.94
         20 |        606        6.06       84.00
         21 |          5        0.05       84.05
         28 |      1,207       12.07       96.12
         29 |         13        0.13       96.25
         32 |          1        0.01       96.26
         40 |        179        1.79       98.05
         50 |         11        0.11       98.16
         65 |         23        0.23       98.39
         97 |         25        0.25       98.64
         98 |         33        0.33       98.97
         99 |        103        1.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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