Frequencies for pbus_use variable in parkwork dataset :

    bus use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,129       99.65       99.65
          1 |          2        0.18       99.82
          5 |          1        0.09       99.91
          6 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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