Frequencies for first 10,000 rows of a_drowsy variable in acc_aux dataset :

Involving a |
     Drowsy |
     Driver |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        174        1.74        1.74
          2 |      9,826       98.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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