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

       Fuel |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         16        0.16        0.16
          * |      4,378       43.78       43.94
          9 |      4,453       44.53       88.47
          D |         26        0.26       88.73
          G |      1,127       11.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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