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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        695        6.95        6.95
          1 |      6,176       61.76       68.71
          2 |      2,603       26.03       94.74
          3 |        375        3.75       98.49
          4 |        101        1.01       99.50
          5 |         35        0.35       99.85
          6 |          6        0.06       99.91
          7 |          4        0.04       99.95
          8 |          2        0.02       99.97
          9 |          1        0.01       99.98
         10 |          1        0.01       99.99
         11 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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