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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,662       66.62       66.62
          2 |      2,667       26.67       93.29
          3 |        433        4.33       97.62
          4 |        104        1.04       98.66
          5 |         37        0.37       99.03
          6 |         22        0.22       99.25
          7 |         15        0.15       99.40
          8 |          9        0.09       99.49
          9 |          9        0.09       99.58
         10 |          6        0.06       99.64
         11 |          6        0.06       99.70
         12 |          4        0.04       99.74
         13 |          4        0.04       99.78
         14 |          4        0.04       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