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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          8        0.08        0.08
          * |      6,331       63.31       63.39
          9 |        552        5.52       68.91
          C |          1        0.01       68.92
          D |        846        8.46       77.38
          E |          1        0.01       77.39
          F |         44        0.44       77.83
          G |      2,215       22.15       99.98
          N |          1        0.01       99.99
          P |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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