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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.03        0.03
          * |      6,316       63.16       63.19
          9 |        618        6.18       69.37
          D |        872        8.72       78.09
          F |         34        0.34       78.43
          G |      2,156       21.56       99.99
          P |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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