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28days
2009 Sep 30
5
Condition to factor (easy to remember)
...,10,50,70)
levs = c("Pre","Post")
# Typical C-Programmer style
factor(levs[as.integer(data >10)+1], levels=levs)
# Easiest to understand
factor(ifelse(data <=10, levs[1], levs[2]), levels=levs)
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