Frequencies for veh_no variable in vehnit dataset :

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         65        4.89        4.89
          2 |        694       52.26       57.15
          3 |        314       23.64       80.80
          4 |        122        9.19       89.98
          5 |         55        4.14       94.13
          6 |         26        1.96       96.08
          7 |         16        1.20       97.29
          8 |         10        0.75       98.04
          9 |          6        0.45       98.49
         10 |          4        0.30       98.80
         11 |          3        0.23       99.02
         12 |          2        0.15       99.17
         13 |          2        0.15       99.32
         14 |          2        0.15       99.47
         15 |          2        0.15       99.62
         16 |          2        0.15       99.77
         17 |          2        0.15       99.92
         18 |          1        0.08      100.00
------------+-----------------------------------
      Total |      1,328      100.00

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