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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.04        0.04
          * |      6,513       65.13       65.17
          9 |        512        5.12       70.29
          D |        927        9.27       79.56
          E |          1        0.01       79.57
          F |         52        0.52       80.09
          G |      1,990       19.90       99.99
          N |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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