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

     veh_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,273       12.73       12.73
          1 |      5,941       59.41       72.14
          2 |      2,351       23.51       95.65
          3 |        319        3.19       98.84
          4 |         70        0.70       99.54
          5 |         18        0.18       99.72
          6 |          5        0.05       99.77
          7 |          3        0.03       99.80
          8 |          2        0.02       99.82
          9 |          2        0.02       99.84
         10 |          2        0.02       99.86
         11 |          1        0.01       99.87
         12 |          1        0.01       99.88
         13 |          1        0.01       99.89
         14 |          1        0.01       99.90
         15 |          1        0.01       99.91
         16 |          1        0.01       99.92
         17 |          1        0.01       99.93
         18 |          1        0.01       99.94
         19 |          1        0.01       99.95
         20 |          1        0.01       99.96
         21 |          1        0.01       99.97
         22 |          1        0.01       99.98
         23 |          1        0.01       99.99
         24 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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