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Last data update: 2014.03.03

R: Distance Between Groups

deltas

R Documentation

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")

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.

Value

A matrix containing the distances between each pair of groups.

Author(s)

Itziar Irigoien itziar.irigoien@ehu.es; Konputazio Zientziak eta Adimen Artifiziala, Euskal Herriko Unibertsitatea (UPV-EHU), Donostia, Spain.

Conchita Arenas carenas@ub.edu; 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.

Examples

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

Results


R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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> library(ICGE)
Loading required package: MASS
Loading required package: cluster
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/ICGE/deltas.Rd_%03d_medium.png", width=480, height=480)
> ### Name: deltas
> ### Title: Distance Between Groups
> ### Aliases: deltas
> ### Keywords: multivariate
> 
> ### ** Examples
> 
> data(iris)
> d <- dist(iris[,1:4])
> deltas(d,iris[,5])
     
group        1         2         3
    1  0.00000 10.293068 22.605340
    2 10.29307  0.000000  2.625984
    3 22.60534  2.625984  0.000000
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>