Frequencies for bus_use variable in vehnit dataset :

    BUS USE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,265       99.45       99.45
          1 |          1        0.08       99.53
          5 |          2        0.16       99.69
          7 |          1        0.08       99.76
          9 |          3        0.24      100.00
------------+-----------------------------------
      Total |      1,272      100.00

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