Hi R users:
I found that I cannot stack() a data.frame with factors.
db1<-data.frame(replicate(6,factor(sample(c("A","B"),6,replace=TRUE))))
str(db1)
db2<-stack(db1)
db2
"db2" does not have any row.
How can I stack them by the variables X1,X2,...,X6?
Thank you for your help.
Kenneth
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