ExtractAIC.glm: Return AIC, AICc or BIC from a glm object

In HelpersMG: Tools for Environmental Analyses, Ecotoxicology and Various R Functions

Return AIC, AICc or BIC from a glm object

Description

For glm fits the family's aic() function is used to compute the AIC.
The choice between different criteria is done by setting a global option AIC. It can be checked using show.option=TRUE. Indeed, it is not possible to use the ... parameter due to a bug in some functions of MASS package. If you want to use this function as a replacement for setpAIC(), do extractAIC.glm <- ExtractAIC.glm before.

Usage

ExtractAIC.glm(fit, scale = 0, k = 2, ...)

Arguments

fit	fitted model, the result of a fitter glm.
scale	unused for glm.
k	numeric specifying the ‘weight’ of the equivalent degrees of freedom (=: edf) part in the AIC formula.
...	further arguments (currently unused because addterm.glm and dropterm.glm using this function do not transmit them).

Details

ExtractAIC.glm returns AIC, AICc or BIC from a glm object

Value

A numeric named vector of length 2, with first and second elements giving
edf the ‘equivalent degrees of freedom’ for the fitted model fit.
x the Information Criterion for fit.

Author(s)

Modified from stats:::extract.AIC.glm

See Also

Other AIC: FormatCompareAIC(), compare_AIC(), compare_AICc(), compare_BIC()

Examples

extractAIC.glm <- ExtractAIC.glm
n <- 100
x <- rnorm(n, 20, 2)
A <- rnorm(n, 20, 5)
g <- glm(x ~ A)
extractAIC(g, show.option=TRUE)
options(AIC="AIC")
extractAIC(g)
options(AIC="BIC")
extractAIC(g)
options(AIC="AICc")
extractAIC(g)

HelpersMG documentation built on Sept. 12, 2024, 9:35 a.m.