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

     veh_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,317       13.17       13.17
          1 |      5,747       57.47       70.64
          2 |      2,345       23.45       94.09
          3 |        393        3.93       98.02
          4 |         94        0.94       98.96
          5 |         31        0.31       99.27
          6 |         19        0.19       99.46
          7 |         14        0.14       99.60
          8 |          7        0.07       99.67
          9 |          4        0.04       99.71
         10 |          3        0.03       99.74
         11 |          2        0.02       99.76
         12 |          2        0.02       99.78
         13 |          2        0.02       99.80
         14 |          2        0.02       99.82
         15 |          2        0.02       99.84
         16 |          2        0.02       99.86
         17 |          1        0.01       99.87
         18 |          1        0.01       99.88
         19 |          1        0.01       99.89
         20 |          1        0.01       99.90
         21 |          1        0.01       99.91
         22 |          1        0.01       99.92
         23 |          1        0.01       99.93
         24 |          1        0.01       99.94
         25 |          1        0.01       99.95
         26 |          1        0.01       99.96
         27 |          1        0.01       99.97
         28 |          1        0.01       99.98
         29 |          1        0.01       99.99
         30 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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