car (version 1.2-12)

levene.test: Levene's Test

Description

Computes Levene's test for homeogeneity of variance across groups.

Usage

levene.test(y, ...)
## S3 method for class 'formula':
levene.test(y, ...)
## S3 method for class 'lm':
levene.test(y, ...)
## S3 method for class 'default':
levene.test(y, group, ...)

Arguments

y
response variable for the default method, or lm or formula object. If y is a linear-model object or a formula, the variables on the right-hand-side of the model must all be factors and must be completely cr
group
factor defining groups.
...
arguments to be passed down, e.g., data for the formula and lm methods.

Value

  • returns an object meant to be printed showing the results of the test.

References

Fox, J. (1997) Applied Regression, Linear Models, and Related Methods. Sage.

Examples

Run this code
with(Moore, levene.test(conformity, fcategory))
## Levene's Test for Homogeneity of Variance
##       Df F value Pr(>F)
## group  2   0.046 0.9551
##       42  

with(Moore, levene.test(conformity, interaction(fcategory, partner.status)))
## Levene's Test for Homogeneity of Variance
##       Df F value Pr(>F)
## group  5  1.4694 0.2219
##       39 

levene.test(conformity ~ fcategory*partner.status, data=Moore)
levene.test(lm(conformity ~ fcategory*partner.status, data=Moore))

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