WeightedCluster (version 1.8-0)

wcSilhouetteObs: Compute the silhouette of each object using weighted data.

Description

Compute the silhouette of each object using weighted data.

Usage

wcSilhouetteObs(diss, clustering, weights = NULL, measure="ASW")

Value

A numeric vector containing the silhouette of each observation.

Arguments

diss

A dissimilarity matrix or a dist object (see dist)

clustering

Factor. A vector of clustering membership.

weights

optional numerical vector containing weights.

measure

"ASW" or "ASWw", the measure of the silhouette. See the WeigthedCluster vignettes.

Details

See the silhouette function in the cluster package for a detailed explanation of the silhouette.

References

Maechler, M., P. Rousseeuw, A. Struyf, M. Hubert and K. Hornik (2011). cluster: Cluster Analysis Basics and Extensions. R package version 1.14.1 --- For new features, see the 'Changelog' file (in the package source).

See Also

See also silhouette.

Examples

data(mvad)
## Aggregating state sequence
aggMvad <- wcAggregateCases(mvad[, 17:86], weights=mvad$weight)

## Creating state sequence object
mvad.seq <- seqdef(mvad[aggMvad$aggIndex, 17:86], weights=aggMvad$aggWeights)
## Computing Hamming distance between sequence
diss <- seqdist(mvad.seq, method="HAM")

## KMedoids using PAMonce method (clustering only)
clust5 <- wcKMedoids(diss, k=5, weights=aggMvad$aggWeights, cluster.only=TRUE)

## Compute the silhouette of each observation
sil <- wcSilhouetteObs(diss, clust5, weights=aggMvad$aggWeights, measure="ASWw")

## If you want to compute the average silhouette width, 
## you should take weights into account
weighted.mean(sil, w=aggMvad$aggWeights)

## Plotting sequences ordred by silhouette width, 
## best classified are draw on the top.
seqIplot(mvad.seq, group=clust5, sortv=sil)