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

    traffic |
    control |
     device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,690       76.90       76.90
          1 |         45        0.45       77.35
          2 |        529        5.29       82.64
          3 |        764        7.64       90.28
          4 |         25        0.25       90.53
          7 |          3        0.03       90.56
          8 |          4        0.04       90.60
         20 |        471        4.71       95.31
         21 |         14        0.14       95.45
         23 |          4        0.04       95.49
         28 |        187        1.87       97.36
         29 |          1        0.01       97.37
         40 |        160        1.60       98.97
         50 |          8        0.08       99.05
         65 |         24        0.24       99.29
         97 |         15        0.15       99.44
         98 |         14        0.14       99.58
         99 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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