Frequencies for cargo_bt variable in vehicle dataset :

 CARGO BODY |
       TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        683       89.40       89.40
          8 |          4        0.52       89.92
         97 |          6        0.79       90.71
         98 |         28        3.66       94.37
         99 |         43        5.63      100.00
------------+-----------------------------------
      Total |        764      100.00

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