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

     veh_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,339       13.39       13.39
          1 |      5,774       57.74       71.13
          2 |      2,356       23.56       94.69
          3 |        391        3.91       98.60
          4 |         96        0.96       99.56
          5 |         27        0.27       99.83
          6 |          7        0.07       99.90
          7 |          2        0.02       99.92
          8 |          2        0.02       99.94
          9 |          2        0.02       99.96
         10 |          1        0.01       99.97
         11 |          1        0.01       99.98
         12 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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