log_CT_plus {COINr}

Log transform a vector (skew corrected)

Description

Performs a log transform on a numeric vector, but with consideration for the direction of the skew. The aim here is to reduce the absolute value of skew, regardless of its direction.

Usage

log_CT_plus(x, na.rm = FALSE)

Arguments

x

A numeric vector

na.rm

Set TRUE to remove NA values, otherwise returns NA.

Details

Specifically:

If the skew of x is positive, this performs a modified "COIN Tool log" transform: log(x-min(x) + a), where a <- 0.01*(max(x)-min(x)).

If the skew of x is negative, it performs an equivalent transformation -log(xmax + a - x).

Value

A log-transformed vector of data, and treatment details wrapped in a list.

Examples

x <- runif(20)
log_CT(x)