Directional: spherconc.test – R documentation

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spherconc.test

Test for equality of concentration parameters for spherical data

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

spherconc.test(x, ina)

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

The test is designed for spherical data only.

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.

Michail Tsagris

R implementation and documentation: Michail Tsagris mtsagris@uoc.gr and Giorgos Athineou <gioathineou@gmail.com>

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

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

A Collection of R Functions for Directional Data Analysis

v4.9

GPL-2

Authors

Michail Tsagris, Giorgos Athineou, Anamul Sajib, Eli Amson, Micah J. Waldstein

Initial release

2021-03-26