Hi Carl,
you may want to check out the cut-function:
library("data.table")
dt <- data.table(a = 1:10, b = sample(c(200:50000), 10), c = 21:30)
dt[, level := cut(b, breaks = c(0, 12000, 34000, max(b)),
labels = c("first", "second", "third"))]
Cheers,
Jannes
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