Frequencies for bus_use variable in vehnit dataset :

    BUS USE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,325       99.77       99.77
          2 |          1        0.08       99.85
          9 |          2        0.15      100.00
------------+-----------------------------------
      Total |      1,328      100.00

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