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RDocumentation: levels
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  • Note that this notebook was automatically generated from an RDocumentation page. It depends on the package and the example code whether this code will run without errors. You may need to edit the code to make things work.

    if(!require('base')) {
        install.packages('base')
        library('base')
    }
    ## assign individual levels
    x <- gl(2, 4, 8)
    levels(x)[1] <- "low"
    levels(x)[2] <- "high"
    x
    
    ## or as a group
    y <- gl(2, 4, 8)
    levels(y) <- c("low", "high")
    y
    
    ## combine some levels
    z <- gl(3, 2, 12, labels = c("apple", "salad", "orange"))
    z
    levels(z) <- c("fruit", "veg", "fruit")
    z
    
    ## same, using a named list
    z <- gl(3, 2, 12, labels = c("apple", "salad", "orange"))
    z
    levels(z) <- list("fruit" = c("apple","orange"),
                      "veg"   = "salad")
    z
    
    ## we can add levels this way:
    f <- factor(c("a","b"))
    levels(f) <- c("c", "a", "b")
    f
    
    f <- factor(c("a","b"))
    levels(f) <- list(C = "C", A = "a", B = "b")
    f