Frequencies for cargo_bt variable in vehicle dataset :

 CARGO BODY |
       TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        548       87.54       87.54
         21 |          1        0.16       87.70
         98 |         24        3.83       91.53
         99 |         53        8.47      100.00
------------+-----------------------------------
      Total |        626      100.00

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