Frequencies for first 10,000 rows of a_spveh variable in veh_aux dataset :

   Speeding |
    Vehicle |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,636       26.36       26.36
          2 |      7,364       73.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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