Frequencies for first 10,000 rows of fldcd_tr variable in vehicle dataset :

       Fuel |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         11        0.11        0.11
          * |      4,601       46.01       46.12
          9 |      3,756       37.56       83.68
          D |        119        1.19       84.87
          G |      1,513       15.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016