Frequencies for fldcd_tr variable in vehnit dataset :

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          * |        793       56.93       56.93
          9 |         96        6.89       63.82
          D |        218       15.65       79.47
          F |          4        0.29       79.76
          G |        282       20.24      100.00
------------+-----------------------------------
      Total |      1,393      100.00

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