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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        727        7.27        7.27
          1 |      6,159       61.59       68.86
          2 |      2,535       25.35       94.21
          3 |        396        3.96       98.17
          4 |         84        0.84       99.01
          5 |         18        0.18       99.19
          6 |         18        0.18       99.37
          7 |          8        0.08       99.45
          8 |          6        0.06       99.51
          9 |          9        0.09       99.60
         10 |          2        0.02       99.62
         11 |          3        0.03       99.65
         12 |          3        0.03       99.68
         13 |          9        0.09       99.77
         14 |          3        0.03       99.80
         15 |          2        0.02       99.82
         16 |          3        0.03       99.85
         17 |          1        0.01       99.86
         18 |          1        0.01       99.87
         19 |          1        0.01       99.88
         20 |          1        0.01       99.89
         21 |          1        0.01       99.90
         22 |          1        0.01       99.91
         23 |          1        0.01       99.92
         24 |          1        0.01       99.93
         25 |          1        0.01       99.94
         26 |          1        0.01       99.95
         27 |          1        0.01       99.96
         28 |          1        0.01       99.97
         29 |          1        0.01       99.98
         30 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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