logit: Logit Transformation

In secr: Spatially Explicit Capture-Recapture

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))

secr documentation built on Nov. 4, 2024, 9:06 a.m.