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

     veh_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,250       12.50       12.50
          1 |      5,882       58.82       71.32
          2 |      2,296       22.96       94.28
          3 |        396        3.96       98.24
          4 |        109        1.09       99.33
          5 |         36        0.36       99.69
          6 |         11        0.11       99.80
          7 |          7        0.07       99.87
          8 |          3        0.03       99.90
          9 |          1        0.01       99.91
         10 |          1        0.01       99.92
         11 |          1        0.01       99.93
         12 |          1        0.01       99.94
         13 |          1        0.01       99.95
         14 |          1        0.01       99.96
         15 |          1        0.01       99.97
         16 |          1        0.01       99.98
         17 |          1        0.01       99.99
         18 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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