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

    Vehicle |
      Event |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,087       40.87       40.87
          2 |      2,203       22.03       62.90
          3 |      1,549       15.49       78.39
          4 |        991        9.91       88.30
          5 |        577        5.77       94.07
          6 |        306        3.06       97.13
          7 |        153        1.53       98.66
          8 |         78        0.78       99.44
          9 |         32        0.32       99.76
         10 |         16        0.16       99.92
         11 |          5        0.05       99.97
         12 |          2        0.02       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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