Frequencies for pveh_sc2 variable in parkwork dataset :

    vehicle |
    related |
factors (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,143       99.74       99.74
         99 |          3        0.26      100.00
------------+-----------------------------------
      Total |      1,146      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016