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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        682        6.82        6.82
          1 |      6,711       67.11       73.93
          2 |      2,157       21.57       95.50
          3 |        336        3.36       98.86
          4 |         80        0.80       99.66
          5 |         31        0.31       99.97
          6 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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