longitudinalData (version 2.3)

partition: ~ Function: partition ~

Description

partition is the constructor of the class Partition. It can be build either alone or relatively to a object LongData.

Usage

partition(clusters, traj, details=character())

Arguments

clusters

[vector(factor)]: cluters to which each individual belongs. Each clusters is represented by an upper letters.

traj

[matrix] or [array]: if an object LongData is provide, it will be used to compute the quality criterion of the clustering. array are simply turn into matrix by "sticking" all the variables

details

[vector(character)]: the slot details is used to store various informations. If the Partition has been find using an algorithm, it can store the name of the algorithm, the time before convergence, the

Value

• An object of class Partition.

Author

Christophe Genolini 1. UMR U1027, INSERM, Universit� Paul Sabatier / Toulouse III / France 2. CeRSM, EA 2931, UFR STAPS, Universit� de Paris Ouest-Nanterre-La D�fense / Nanterre / France

Details

partition construct a object of class Partition. It does not provide any default values. yLongData and details are optional.

References

[1] Christophe M. Genolini and Bruno Falissard "KmL: k-means for longitudinal data" Computational Statistics, vol 25(2), pp 317-328, 2010 [2] Christophe M. Genolini and Bruno Falissard "KmL: A package to cluster longitudinal data" Computer Methods and Programs in Biomedicine, 104, pp e112-121, 2011

See Also

Partition,ordered

Examples

### Empty partition
partition()

### Small partition
partition(clusters=c("A","B","A","C","C"))

### Random partition
partition(clusters=LETTERS[floor(runif(100,1,5))])

### Partition that clusters correctly some data
###   Quality criterion are high
data(artificialLongData)
traj <- as.matrix(artificialLongData[,-1])
partition(clusters=rep(1:4,each=50),traj)

### Partition that does not cluster correctly the data
###   Quality criterion are low
partition(clusters=rep(1:4,50),traj)