spherconc.test: Test for equality of concentration parameters for spherical...

In Directional: A Collection of Functions for Directional Data Analysis

Test for equality of concentration parameters for spherical data

Description

This tests the equality of concentration parameters for spherical data only.

Usage

spherconc.test(x, ina)

Arguments

x	A matrix with the data in Euclidean coordinates, i.e. unit vectors
ina	A variable indicating the groupings of the observations.

Details

The test is designed for spherical data only.

Value

A list including:

mess	A message stating the value of the mean resultant and which test statistic was used, U1, U2 or U3.
res	A vector containing the test statistic and its p-value.

Author(s)

Michail Tsagris.

R implementation and documentation: Michail Tsagris [e-mail] and Giorgos Athineou <[e-mail]>.

References

Kanti V. Mardia and Peter E. Jupp. Directional statistics, pg. 226–227.

See Also

het.aov, lr.aov, embed.aov, hcf.aov, conc.test, sphereplot

Examples

x <- rvmf(100, rnorm(3), 15)
ina <- rep(1:4, each = 25)
spherconc.test(x, ina)

Directional documentation built on Oct. 30, 2024, 9:15 a.m.