How to convert a chr variable to a factor variable to be able to identify levels

You can use as.factor() function

x <- c("a", "b", "c")
#> [1] "character"
x <- as.factor(x)
#> [1] "factor"
#> [1] a b c
#> Levels: a b c
#> [1] "a" "b" "c"

Created on 2019-03-06 by the reprex package (v0.2.1)

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