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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,254       12.54       12.54
          1 |      5,911       59.11       71.65
          2 |      2,221       22.21       93.86
          3 |        401        4.01       97.87
          4 |        125        1.25       99.12
          5 |         37        0.37       99.49
          6 |         18        0.18       99.67
          7 |         10        0.10       99.77
          8 |          5        0.05       99.82
          9 |          5        0.05       99.87
         10 |          4        0.04       99.91
         11 |          4        0.04       99.95
         12 |          2        0.02       99.97
         13 |          2        0.02       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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