dfpk (version 2.0.0)

invlogit: Inverse logistic functions.

Description

Inverse-logit function, transforms continuous values to the range (0, 1)

Usage

invlogit(x)

Arguments

x

A vector of continuous values

Value

A vector of estimated probabilities

Details

The Inverse-logit function defined as: $logit^-1(x) = e^x/(1+e^x)$ transforms continuous values to the range (0, 1), which is necessary, since probabilities must be between 0 and 1 and maps from the linear predictor to the probabilities.

References

Ursino, M., et al, (2016) Dose-finding methods using pharmacokinetics in small populations (under review).

Examples

 n <- 100
 x1 <- rnorm (n)
 x2 <- rbinom (n, 1, .5)
 b0 <- 1
 b1 <- 1.5
 b2 <- 2
 Inv.logit <- invlogit(b0+b1*x1+b2*x2)
 plot(b0+b1*x1+b2*x2, Inv.logit)