logistic: Bivariate logistic function

In adamlilith/enmSdmPredImport: Testing measures of predictor importance in species distribution models

Bivariate logistic function

Description

The bivariate logistic function.

Usage

logistic(x1, x2 = 0, b0 = 0, b1 = 1, b2 = 0, b12 = 0, ...)

Arguments

x1	Numeric, first variable.
x2	Numeric, second variable. Default is 0 (makes the function respond only to x1 so it is univariate).
b0	Numeric, intercept. Default is 0.
b1	Numeric, slope with respect to x1. Default is 1.
b2	Numeric, slope with respect to x2. Default is 0.
b12	Numeric, slope with respect to x1 * x2. Default is 0 (no interaction).
...	Other arguments (not used).

Value

A logistic function.

Examples

x1 <- seq(-1, 1, by=0.01)
pr1 <- logistic(x1=x1, b1=1)
pr2 <- logistic(x1=x1, b1=2)
pr3 <- logistic(x1=x1, b1=3)
pr4 <- logistic(x1=x1, b0=-1, b1=3)

plot(x1, pr1, ylab='Logistic output', type='l', ylim=c(0, 1))
lines(x1, pr2, col='red')
lines(x1, pr3, col='blue')
lines(x1, pr4, col='green')

adamlilith/enmSdmPredImport documentation built on Dec. 31, 2022, 5:40 p.m.