Frequencies for fldcd_tr variable in vehnit dataset :

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          * |        677       53.22       53.22
          9 |         79        6.21       59.43
          C |          1        0.08       59.51
          D |        202       15.88       75.39
          F |         11        0.86       76.26
          G |        302       23.74      100.00
------------+-----------------------------------
      Total |      1,272      100.00

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