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

    Vehicle |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,570       65.70       65.70
          2 |      2,667       26.67       92.37
          3 |        516        5.16       97.53
          4 |        144        1.44       98.97
          5 |         53        0.53       99.50
          6 |         18        0.18       99.68
          7 |          9        0.09       99.77
          8 |          6        0.06       99.83
          9 |          3        0.03       99.86
         10 |          3        0.03       99.89
         11 |          3        0.03       99.92
         12 |          3        0.03       99.95
         13 |          2        0.02       99.97
         14 |          2        0.02       99.99
         15 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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