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

     veh_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,280       12.80       12.80
          1 |      5,912       59.12       71.92
          2 |      2,385       23.85       95.77
          3 |        321        3.21       98.98
          4 |         63        0.63       99.61
          5 |         20        0.20       99.81
          6 |          8        0.08       99.89
          7 |          4        0.04       99.93
          8 |          2        0.02       99.95
          9 |          1        0.01       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