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

       Fuel |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         15        0.15        0.15
          * |      6,241       62.41       62.56
          9 |      1,198       11.98       74.54
          D |        454        4.54       79.08
          G |      2,090       20.90       99.98
          P |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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