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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        649        6.49        6.49
          1 |      6,482       64.82       71.31
          2 |      2,351       23.51       94.82
          3 |        389        3.89       98.71
          4 |         78        0.78       99.49
          5 |         33        0.33       99.82
          6 |          7        0.07       99.89
          7 |          2        0.02       99.91
          8 |          5        0.05       99.96
          9 |          1        0.01       99.97
         10 |          1        0.01       99.98
         11 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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