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

    traffic |
    control |
     device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,780       77.80       77.80
          1 |         44        0.44       78.24
          2 |        357        3.57       81.81
          3 |        810        8.10       89.91
          4 |         24        0.24       90.15
          8 |          4        0.04       90.19
          9 |          2        0.02       90.21
         20 |        463        4.63       94.84
         21 |         17        0.17       95.01
         28 |        218        2.18       97.19
         29 |          4        0.04       97.23
         40 |        136        1.36       98.59
         50 |          8        0.08       98.67
         65 |         17        0.17       98.84
         97 |         29        0.29       99.13
         98 |         14        0.14       99.27
         99 |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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