Logit {DescTools} R Documentation

## Generalized Logit and Inverse Logit Function

### Description

Compute generalized logit and generalized inverse logit functions.

### Usage

Logit(x, min = 0, max = 1)
LogitInv(x, min = 0, max = 1)


### Arguments

 x value(s) to be transformed min lower end of logit interval max upper end of logit interval

### Details

The generalized logit function takes values on [min, max] and transforms them to span [-\infty, \infty ].
It is defined as:

y = log\left (\frac{p}{1-p} \right ) \;\;\; \; \textup{where} \; \;\; p=\frac{x-min}{max-min}

The generalized inverse logit function provides the inverse transformation:

x = p' \cdot (max-min) + min \;\;\; \; \textup{where} \; \;\; p'=\frac{exp(y)}{1+exp(y)}

### Value

Transformed value(s).

### Author(s)

Gregory R. Warnes greg@warnes.net

logit

### Examples


x <- seq(0,10, by=0.25)
xt <- Logit(x, min=0, max=10)
cbind(x,xt)

y <- LogitInv(xt, min=0, max=10)
cbind(x, xt, y)



[Package DescTools version 0.99.51 Index]