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 |         38        0.38       77.39
          2 |        326        3.26       80.65
          3 |        810        8.10       88.75
          4 |         33        0.33       89.08
          8 |          7        0.07       89.15
          9 |          2        0.02       89.17
         20 |        493        4.93       94.10
         21 |         21        0.21       94.31
         23 |          4        0.04       94.35
         28 |        211        2.11       96.46
         40 |        195        1.95       98.41
         50 |         11        0.11       98.52
         65 |         19        0.19       98.71
         97 |         16        0.16       98.87
         98 |         49        0.49       99.36
         99 |         64        0.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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