Frequencies for first 10,000 rows of veh_no variable in vehicle dataset :

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,656       66.56       66.56
          2 |      2,727       27.27       93.83
          3 |        462        4.62       98.45
          4 |         99        0.99       99.44
          5 |         31        0.31       99.75
          6 |         11        0.11       99.86
          7 |          7        0.07       99.93
          8 |          4        0.04       99.97
          9 |          2        0.02       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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