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

    traffic |
    control |
     device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,701       77.01       77.01
          1 |         36        0.36       77.37
          2 |        381        3.81       81.18
          3 |        868        8.68       89.86
          4 |         34        0.34       90.20
          7 |          1        0.01       90.21
          8 |          5        0.05       90.26
          9 |          2        0.02       90.28
         20 |        473        4.73       95.01
         21 |          9        0.09       95.10
         28 |        174        1.74       96.84
         29 |          3        0.03       96.87
         40 |        163        1.63       98.50
         50 |          6        0.06       98.56
         65 |         22        0.22       98.78
         97 |         40        0.40       99.18
         98 |          9        0.09       99.27
         99 |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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