adonis.II {RVAideMemoire}

Type II permutation MANOVA using distance matrices

Description

This function is a wrapper to adonis but performs type II tests (whereas adonis performs type I).

Usage

adonis.II(formula, data, ...)

Arguments

formula

a typical model formula such as Y~A+B*C, but where Y is either a dissimilarity object (inheriting from class "dist") or data frame or a matrix; A, B, and C may be factors or continuous variables.

data

the data frame from which A, B and C would be drawn.

...

additional arguments to adonis. See help of this function.

Details

See adonis for detailed explanation of what is done. The only difference with adonis is that adonis.II performs type II tests instead of type I.

Value

a data frame of class "anova".

Author(s)

Maxime HERVE <[e-mail]>

Examples

require(vegan)
data(dune)
data(dune.env)

# Compare:
adonis(dune~Management*A1,data=dune.env,permutations=99)
adonis(dune~A1*Management,data=dune.env,permutations=99)

# With:
adonis.II(dune~Management*A1,data=dune.env,permutations=99)
adonis.II(dune~A1*Management,data=dune.env,permutations=99)