Hi ozgrerg,
I am not a "good" R user, but according to me you can do this;
data <- data.frame(x=c("A","A","B","A"), y=c("A","B","B","B"))
for (i in 1:nrow(data)){
if(data$x[i]=="B"||data$y[i]=="B") z[i]=c("B")
else
z[i]=c("NA")
}
cbind(data,z)
--
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