statisfactory (version 1.0.4)

invLogitAdj: Inverse logit is robust to cases that equal 0 or 1

Description

This function is the inverse of logitAdj. That function calculates the logit of values but is robust to cases where the operand is 0 or 1. The adjusted inverse logit is equal to (base^x + epsilon * base^x - epsilon) / (base^x + 1).

Usage

invLogitAdj(x, epsilon = 0.01, base = 10, auto = FALSE)

Value

Numeric.

Arguments

x

Numeric vector.

epsilon

Value or character. If a numeric value (typically ~0.01 or smaller), then this is added/subtracted from x to ensure log of 0 or 1 is not taken. If equal to 'auto' then the value of epsilon is taken from the attributes of x. If x has no such attribute, a warning is given and a value of 0.01 is used.

base

Base of logarithm. Use base=exp(1) for base e.

auto

If TRUE then if the attributes of x have slots named epsilon and base then use these instead of the user-supplied values of epsilon and base. If they do not appear as attributes of x but auto is TRUE then the function prints warnings and uses 0.01 and 10, respectively. If FALSE (default) then use the user-supplied values of epsilon and base.

See Also

logitAdj

Examples

x <- seq(0, 1, by=0.1)
y <- logitAdj(x)
xx <- invLogitAdj(y, auto = TRUE)