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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,104       11.04       11.04
          1 |      5,934       59.34       70.38
          2 |      2,346       23.46       93.84
          3 |        420        4.20       98.04
          4 |        112        1.12       99.16
          5 |         44        0.44       99.60
          6 |         15        0.15       99.75
          7 |          9        0.09       99.84
          8 |          6        0.06       99.90
          9 |          6        0.06       99.96
         10 |          2        0.02       99.98
         11 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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