Frequencies for veh_no variable in vehicle dataset :

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        465       74.28       74.28
          2 |        142       22.68       96.96
          3 |         16        2.56       99.52
          4 |          2        0.32       99.84
          5 |          1        0.16      100.00
------------+-----------------------------------
      Total |        626      100.00

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