dprep (version 3.0.2)

vvalen: The Van Valen test for equal covariance matrices

Description

The Van Valen nonparametric test for homocedasticity (equal covariance matrices).

Usage

vvalen(data)

Arguments

data

The name of the dataset to be tested

Value

Gives the p-value for a Kruskal Wallis test. A p-value near to zero indicates homocedasticity.

References

Van Valen, L. (1962). A study of fluctuating asymmetry. Evolution Vol. 16, pp. 125142.

See Also

mardia

Examples

#---------Testing homocedasticity-----
data(colon)
vvalen(colon)