Frequencies for veh_no variable in vehicle dataset :

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        548       71.73       71.73
          2 |        187       24.48       96.20
          3 |         26        3.40       99.61
          4 |          3        0.39      100.00
------------+-----------------------------------
      Total |        764      100.00

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