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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        665        6.65        6.65
          1 |      6,273       62.73       69.38
          2 |      2,384       23.84       93.22
          3 |        450        4.50       97.72
          4 |        135        1.35       99.07
          5 |         44        0.44       99.51
          6 |         11        0.11       99.62
          7 |          4        0.04       99.66
          8 |          5        0.05       99.71
          9 |          6        0.06       99.77
         10 |          6        0.06       99.83
         11 |          9        0.09       99.92
         12 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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