logit {secr}

R Documentation

Logit Transformation

Description

Transform real values to the logit scale, and the inverse.

Usage

logit(x)
invlogit(y)

Arguments

x	vector of numeric values in (0,1) (possibly a probability)
y	vector of numeric values

Details

The logit transformation is defined as \mathrm{logit}(x) = \mathrm{log}( \frac{x}{1-x}) for x \in (0,1).

Value

Numeric value on requested scale.

Note

logit is equivalent to qlogis, and invlogit is equivalent to plogis (both R functions in the stats package). logit and invlogit are used in secr because they are slightly more robust to bad input, and their names are more memorable!

Examples

logit(0.5)
invlogit(logit(0.2))

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