modcheck: Deprecated model checking plots

In s20x: Functions for University of Auckland Course STATS 201/208 Data Analysis

Deprecated model checking plots

Description

'modcheck()' is deprecated and is no longer exported. It plots four model checking plots: residuals versus fitted values, a normal Q-Q plot, a histogram of residuals with a normal distribution superimposed, and a Cook's distance plot.

Usage

modcheck(x, ...)

Arguments

x	a vector of observations, or the residuals from fitting a linear model. Alternatively, a fitted lm object. If x is a single vector, then the implicit assumption is that the mean (or null) model is being fitted, i.e. lm(x ~ 1) and that the data are best summarised by the sample mean.
...	additional parameters. Included for future flexibility, but unsure how this might be used currently.

Value

Draws the selected model checking plots for teaching diagnostics. The function is called for its plotting side effects and does not provide a stable data return object.

s20x documentation built on July 1, 2026, 9:06 a.m.