Combine factor levels
Convenience function to make it easy to combine multiple levels
combine_factor(fac, variable=levels(fac), other.label="Other")
fac |
factor variable |
variable |
either a vector of . See examples for more details. |
other.label |
label for other level |
Hadley Wickham <h.wickham@gmail.com>
df <- data.frame(a = LETTERS[sample(5, 15, replace=TRUE)], y = rnorm(15)) combine_factor(df$a, c(1,2,2,1,2)) combine_factor(df$a, c(1:4, 1)) (f <- reorder(df$a, df$y)) percent <- tapply(abs(df$y), df$a, sum) combine_factor(f, c(order(percent)[1:3]))
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