calcslice: Negative log-likelihood slice

In bbolker/emdbook: Support Functions and Data for "Ecological Models and Data"

Negative log-likelihood slice

Description

Calculate the negative log-likelihood along a line connecting two mle fits

Usage

calcslice(fit1, fit2, fn = fit1@minuslogl, range = c(-0.1, 1.1), n = 400)

Arguments

fit1	An mle object
fit2	Another mle object
fn	Negative log-likelihood function
range	Numeric vector: range of parameters to try, where 0 corresponds to coef(fit1) and 1 corresponds to coef(fit2)
n	Number of points to evaluate

Details

Calculates the negative log-likelihood (not a profile, just a "slice") along the line connecting the two sets of coefficients. Intended for diagnosing and visualizing multiple minima in a likelihood surface, especially in higher-dimensional models.

Value

x	Parameter values, along the 0-1 scale described above
y	Negative log-likelihood values

Author(s)

Ben Bolker

bbolker/emdbook documentation built on July 4, 2023, 1:16 p.m.