Dear list,
I have a question I'm trying to use the following command in R, but it gives
me an error message.The command is:
data<-ddply(data,c("year","name"), transform, check1=ifelse(check1==1 &
check2==1, 1,NULL))
so in my data frame I already have the check1 variable, if the conditions
(check1==1 & check2==1) is respected, check has to have 1 as value, whereas if
it is not I want that variable to maintain its value.
Anyone knows, how to do this, by doing this for name and year??
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