Hello again,
dtf<-read.table(textConnection("Letter Test Number
a b 1
a b 1
b b 1
b b 0
c b 0
c b 1
d b 0
d b 0"),header=T)
aggregate(Number ~ Letter,data=dtf,max)
how can I adjust this solution that the results also includes "Test"?
I tried:
aggregate(Number ~ Letter,data=dtf,max,by=list("Letter", "Test", "Number"))
But it breaks with the following error message:
Error in aggregate.data.frame(mf[1L], mf[-1L], FUN = FUN, ...) :
arguments must have same length
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