Frequencies for pbus_use variable in parkwork dataset :

    bus use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,085       99.63       99.63
          6 |          3        0.28       99.91
         99 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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