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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,115       11.15       11.15
          1 |      5,886       58.86       70.01
          2 |      2,380       23.80       93.81
          3 |        425        4.25       98.06
          4 |        115        1.15       99.21
          5 |         39        0.39       99.60
          6 |         20        0.20       99.80
          7 |         12        0.12       99.92
          8 |          4        0.04       99.96
          9 |          2        0.02       99.98
         10 |          1        0.01       99.99
         11 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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