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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        667        6.67        6.67
          1 |      6,171       61.71       68.38
          2 |      2,526       25.26       93.64
          3 |        490        4.90       98.54
          4 |         99        0.99       99.53
          5 |         26        0.26       99.79
          6 |          8        0.08       99.87
          7 |          5        0.05       99.92
          8 |          2        0.02       99.94
          9 |          2        0.02       99.96
         10 |          1        0.01       99.97
         11 |          1        0.01       99.98
         12 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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