intercept: Intercept estimates from segmented relationships

Description

Computes the intercepts of each `segmented' relationship in the fitted model.

Usage

intercept(ogg, parm, gap = TRUE, rev.sgn = FALSE, var.diff=FALSE,
    digits = max(3, getOption("digits") - 3))

Arguments

ogg

an object of class "segmented", returned by any segmented method.

parm

the segmented variable whose intercepts have to be computed. If missing all the segmented variables in the model are considered.

gap

logical. should the intercepts account for the (possible) gaps?

rev.sgn

vector of logicals. The length should be equal to the length of parm, but it is recycled otherwise. When TRUE it is assumed that the current parm is `minus' the actual segmented variable, therefore the sign i

var.diff

Currently ignored as only point estimates are computed.

digits

controls number of digits in output.

Value

intercept returns a list of one-column matrices. Each matrix represents a segmented relationship.

Details

A broken-line relationship means that a regression equation exists in the intervals `$min(x)$ to $\psi_1$', `$\psi_1$ to $\psi_2$', and so on. intercept computes point estimates of the intercepts of the different regression equations for each segmented relationship in the fitted model.

Examples

Run this code

## see ?slope
intercept(out.seg)