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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,688       66.88       66.88
          2 |      2,649       26.49       93.37
          3 |        464        4.64       98.01
          4 |        123        1.23       99.24
          5 |         42        0.42       99.66
          6 |         13        0.13       99.79
          7 |          8        0.08       99.87
          8 |          3        0.03       99.90
          9 |          1        0.01       99.91
         10 |          1        0.01       99.92
         11 |          1        0.01       99.93
         12 |          1        0.01       99.94
         13 |          1        0.01       99.95
         14 |          1        0.01       99.96
         15 |          1        0.01       99.97
         16 |          1        0.01       99.98
         17 |          1        0.01       99.99
         18 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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