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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        569        5.69        5.69
          1 |      6,261       62.61       68.30
          2 |      2,633       26.33       94.63
          3 |        393        3.93       98.56
          4 |         90        0.90       99.46
          5 |         20        0.20       99.66
          6 |         17        0.17       99.83
          7 |          4        0.04       99.87
          8 |          4        0.04       99.91
          9 |          3        0.03       99.94
         10 |          2        0.02       99.96
         12 |          1        0.01       99.97
         13 |          2        0.02       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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