Frequencies for pveh_sc2 variable in parkwork dataset :

    vehicle |
    related |
factors (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,088       99.91       99.91
         99 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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