Logit Transformation

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Description

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

Usage

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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 logit(x) = log(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

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logit(0.5)
invlogit(logit(0.2))

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