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Box−Cox transformation
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| # Box-Cox transformation | |
| box_cox <- function(x, lambda = 0) { | |
| stopifnot(is.numeric(x)) | |
| stopifnot(is.numeric(lambda)) | |
| if (lambda == 0) | |
| x <- log(x) | |
| else | |
| x <- (x^lambda - 1L) / lambda | |
| return(x) | |
| } |
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