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

       Fuel |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         22        0.22        0.22
          * |      4,204       42.04       42.26
          9 |      4,733       47.33       89.59
          D |         26        0.26       89.85
          G |      1,015       10.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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