Replacing numbers with a label in DF [duplicate]

Answer 1

Recode the levels with a list.

table1$Size.fac <- factor(table1$Size)

levels(table1$Size.fac) <- list("small" = 1:10,
                            "medium" = 11:49,
                            "large" = 50:200)

table1
#   Size Size.fac
# 1  156    large
# 2   17   medium
# 3  128    large
# 4    7    small
# 5   77    large
# 6  112    large

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Data:

table1 <- structure(list(Size = c(156L, 17L, 128L, 7L, 77L, 112L)), row.names = c(NA, 
6L), class = "data.frame")