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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          8        0.08        0.08
          * |      6,344       63.44       63.52
          9 |        571        5.71       69.23
          C |          1        0.01       69.24
          D |        769        7.69       76.93
          E |          1        0.01       76.94
          F |         39        0.39       77.33
          G |      2,260       22.60       99.93
          N |          1        0.01       99.94
          P |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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