check_normality: Check the normality assumption of a vector

In michaelmalick/r-malick: Personal R Functions

Description

Check the normality assumption of univariate data or model residuals using graphical methods.

Usage

check_normality(x, panel = TRUE, na.rm = FALSE, title = NULL,
  shapiro.test = FALSE)

Arguments

x	numeric vector
panel	logical, if TRUE a multi-panel graphic is produced, otherwise each graphic is printed individually.
na.rm	logical, should NA values be removed
title	string, optional plot title placed on top outside margin
shapiro.test	logical, should a Shapiro-Wilks test be run

Value

Prints a series of plots:

Histogram	Histogram of data with empirical density overlay (red) and a theoretical normal PDF overlay (grey)
QQ plot	Normal QQ plot
CDF	Empirical (red dots) and theoretical normal (grey line) cumulative distributions

If shapiro.test, then the results of the test are returned

Author(s)

Michael Malick

See Also

dnorm pnorm density plot.ecdf shapiro.test

Examples

 check_normality(rnorm(100))
 check_normality(rnorm(100), panel = FALSE)
 check_normality(rlnorm(100), title = "Title")

michaelmalick/r-malick documentation built on May 22, 2019, 9:51 p.m.