intTab: Interaction table

In robCompositions: Compositional Data Analysis

Interaction table

Description

Estimates the interaction table based on clr and inverse clr coefficients.

Usage

intTab(x, y, frequencies = c("relative", "absolute"))

Arguments

x	an object of class table
y	the corresponding independence table which is of class “intTab”.
frequencies	indicates whether absolute or relative frequencies should be computed.

Details

Because of the compositional nature of probability tables, the independence tables should be estimated using geometric marginals.

Value

intTab

The interaction table(s) with either relative or absolute frequencies.

signs

The sign illustrates if there is an excess of probability (plus), or a deficit (minus) regarding to the estimated probability table and the independece table in the clr space.

Author(s)

Matthias Templ

References

Egozcue, J.J., Pawlowsky-Glahn, V., Templ, M., Hron, K. (2015) Independence in contingency tables using simplicial geometry. Communications in Statistics - Theory and Methods, 44 (18), 3978–3996.

Examples

data(precipitation)
tab1prob <- prop.table(precipitation)
tab1 <- indTab(precipitation)
intTab(tab1prob, tab1)

robCompositions documentation built on Aug. 22, 2025, 5:11 p.m.