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

  VEHICLE # |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,195       11.95       11.95
          1 |      5,912       59.12       71.07
          2 |      2,253       22.53       93.60
          3 |        421        4.21       97.81
          4 |        126        1.26       99.07
          5 |         44        0.44       99.51
          6 |         19        0.19       99.70
          7 |         10        0.10       99.80
          8 |          8        0.08       99.88
          9 |          5        0.05       99.93
         10 |          3        0.03       99.96
         11 |          2        0.02       99.98
         12 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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