Frequencies for first 10,000 rows of veventnum variable in vsoe dataset :

    vehicle |
      event |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,205       42.05       42.05
          2 |      2,230       22.30       64.35
          3 |      1,522       15.22       79.57
          4 |        964        9.64       89.21
          5 |        542        5.42       94.63
          6 |        288        2.88       97.51
          7 |        130        1.30       98.81
          8 |         55        0.55       99.36
          9 |         25        0.25       99.61
         10 |         16        0.16       99.77
         11 |         10        0.10       99.87
         12 |          6        0.06       99.93
         13 |          3        0.03       99.96
         14 |          2        0.02       99.98
         15 |          1        0.01       99.99
         16 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016