Frequencies for veh_no variable in vehicle dataset :

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        524       73.18       73.18
          2 |        166       23.18       96.37
          3 |         21        2.93       99.30
          4 |          5        0.70      100.00
------------+-----------------------------------
      Total |        716      100.00

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