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

  If yes,  are |
there warnings |
       of drug |
  interactions |
            or |
contraindicati |
 ons provided? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |     10,000      100.00      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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