ols_test_bartlett: Bartlett test
In olsrr: Tools for Building OLS Regression Models

Description Usage Arguments Details Value Deprecated Function References See Also Examples

Test if k samples are from populations with equal variances.

ols_test_bartlett(data, ...)

## Default S3 method:
ols_test_bartlett(data, ..., group_var = NULL)

`data`	A `data.frame` or `tibble`.
`...`	Columns in `data`.
`group_var`	Grouping variable.

Bartlett's test is used to test if variances across samples is equal. It is sensitive to departures from normality. The Levene test is an alternative test that is less sensitive to departures from normality.

ols_test_bartlett returns an object of class "ols_test_bartlett". An object of class "ols_test_bartlett" is a list containing the following components:

`fstat`	f statistic
`pval`	p-value of `fstat`
`df`	degrees of freedom

ols_bartlett_test() has been deprecated. Instead use ols_test_bartlett().

Snedecor, George W. and Cochran, William G. (1989), Statistical Methods, Eighth Edition, Iowa State University Press.

Other heteroskedasticity tests: ols_test_breusch_pagan, ols_test_f, ols_test_score

# using grouping variable
library(descriptr)
ols_test_bartlett(mtcarz, 'mpg', group_var = 'cyl')

# using variables
ols_test_bartlett(hsb, 'read', 'write')