Frequencies for veh_no variable in vehicle dataset :

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        343       72.67       72.67
          2 |        103       21.82       94.49
          3 |         19        4.03       98.52
          4 |          5        1.06       99.58
          5 |          2        0.42      100.00
------------+-----------------------------------
      Total |        472      100.00

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