Frequencies for first 10,000 rows of ewarne variable in nhamcsed2013 dataset :

        Are warnings of drug |
             interactions or |
 contraindications provided? |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                       Blank |     10,000      100.00      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016