Frequencies for pfuecode variable in parkwork dataset :

  Fuel Code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         71        6.67        6.67
          B |          5        0.47        7.14
          C |          2        0.19        7.33
          D |        161       15.13       22.46
          E |          1        0.09       22.56
          F |         34        3.20       25.75
          G |        790       74.25      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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