Frequencies for bus_use variable in vehnit dataset :

    BUS USE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,473       99.46       99.46
          4 |          1        0.07       99.53
          5 |          2        0.14       99.66
          6 |          3        0.20       99.86
          9 |          2        0.14      100.00
------------+-----------------------------------
      Total |      1,481      100.00

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