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

 TRUCK FUEL |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.03        0.03
          * |      6,400       64.00       64.03
          9 |        497        4.97       69.00
          D |        951        9.51       78.51
          F |         57        0.57       79.08
          G |      2,090       20.90       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