ICGE (version 0.4.2)

deltas: Distance Between Groups

Description

Assume that n units are divided into k groups C1,...,Ck . Function deltas computes and returns the distance between each pair of groups. It uses the distances between pairs of units.

Usage

deltas(d, pert = "onegroup")

Value

A matrix containing the distances between each pair of groups.

Arguments

d

a distance matrix or a dist object with distance information between units.

pert

an n-vector that indicates which group each unit belongs to. Note that the expected values of pert are numbers greater than or equal to 1 (for instance 1,2,3,4..., k). The default value indicates there is only one group in data.

Author

Itziar Irigoien ; Konputazio Zientziak eta Adimen Artifiziala, Euskal Herriko Unibertsitatea (UPV/EHU), Donostia, Spain.

Conchita Arenas ; Departament d'Estadistica, Universitat de Barcelona, Barcelona, Spain.

References

Arenas, C. and Cuadras, C.M. (2002). Some recent statistical methods based on distances. Contributions to Science, 2, 183--191.

Cuadras, C.M., Fortiana, J. and Oliva, F. (1997). The proximity of an individual to a population with applications in discriminant analysis. Journal of Classification, 14, 117--136.

See Also

vgeo, proxi

Examples

data(iris)
d <- dist(iris[,1:4])
deltas(d,iris[,5])