performance (version 0.3.0)

check_normality: Check model for (non-)normality of residuals.

Description

Check model for (non-)normality of residuals.

Usage

check_normality(x, ...)

Arguments

x

A model object.

...

Currently not used.

Value

Invisibly returns the p-value of the test statistics. A p-value < 0.05 indicates a significant deviation from normal distribution

Details

check_normality() calls shapiro.test and checks the standardized residuals for normal distribution. Note that this formal test almost always yields significant results for the distribution of residuals and visual inspection (e.g. Q-Q plots) are preferable.

Examples

# NOT RUN {
m <- lm(mpg ~ wt + cyl + gear + disp, data = mtcars)
check_normality(m)

# plot results
x <- check_normality(m)
plot(x)

# }
# NOT RUN {
# QQ-plot
plot(check_normality(m), type = "qq")

# PP-plot
plot(check_normality(m), type = "pp")
# }
# NOT RUN {
# }