robCompositions (version 2.4.1)

indTab: Independence table

Description

Estimates the expected frequencies from an m-way table under the null hypotheses of independence.

Usage

indTab(
  x,
  margin = c("gmean_sum", "sum"),
  frequency = c("relative", "absolute"),
  pTabMethod = c("dirichlet", "half", "classical")
)

Value

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

Arguments

x

an object of class table

margin

determines how the margins of the table should be estimated (default via geometric mean margins)

frequency

indicates whether absolute or relative frequencies should be computed.

pTabMethod

to estimate the propability table. Default is ‘dirichlet’. Other available methods: ‘classical’ that is function prop.table() from package base or method “half” that add 1/2 to each cell to avoid zero problems.

Author

Matthias Templ

Details

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

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) 
tab1 <- indTab(precipitation)
tab1
sum(tab1)

if (FALSE) {
data("PreSex", package = "vcd")
indTab(PreSex)
}