Frequencies for pbus_use variable in parkwork dataset :

    bus use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,082       99.18       99.18
          1 |          5        0.46       99.63
          4 |          1        0.09       99.73
          5 |          1        0.09       99.82
          6 |          1        0.09       99.91
         98 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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