Frequencies for first 10,000 rows of bloodalc variable in nhamcsed1999 dataset :

      blood |
    alcohol |
concentrati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,806       98.06       98.06
          1 |        194        1.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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