Frequencies for pbus_use variable in parkwork dataset :

    Bus Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        995       99.30       99.30
          1 |          1        0.10       99.40
          5 |          2        0.20       99.60
          7 |          1        0.10       99.70
         98 |          3        0.30      100.00
------------+-----------------------------------
      Total |      1,002      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016