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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        615        6.15        6.15
          1 |      6,271       62.71       68.86
          2 |      2,553       25.53       94.39
          3 |        402        4.02       98.41
          4 |         93        0.93       99.34
          5 |         40        0.40       99.74
          6 |         12        0.12       99.86
          7 |          6        0.06       99.92
          8 |          2        0.02       99.94
          9 |          2        0.02       99.96
         10 |          2        0.02       99.98
         11 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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