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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          6        0.06        0.06
          * |      6,281       62.81       62.87
          9 |        868        8.68       71.55
          D |        671        6.71       78.26
          G |      2,173       21.73       99.99
          P |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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