Frequencies for first 10,000 rows of bac variable in nhamcsed2010 dataset :

      Blood |
    alcohol |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,681       96.81       96.81
        yes |        319        3.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016