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

       Fuel |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        309        3.09        3.09
          * |      6,071       60.71       63.80
          9 |      1,699       16.99       80.79
          D |        165        1.65       82.44
          G |      1,756       17.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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