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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         13        0.13        0.13
          * |      6,198       61.98       62.11
          9 |        557        5.57       67.68
          D |        876        8.76       76.44
          F |         18        0.18       76.62
          G |      2,337       23.37       99.99
          N |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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