Silh | R Documentation |
Graphical tool to evaluate the clustering partition.
Silh(p)
p |
A matrix of probabilities such that rows correspond to observations and columns correspond to clusters. |
The probabilistic silhouettes are an adaptation of the ones proposed by Menardi(2011) according to the following formula:
dbs_i = (log(p_{im_k}/p_{im_1}))/max_i |log(p_{im_k}/p_{im_1})|
,
where m_k is such that x_i belongs to cluster k and m_1 is such that p_{im_1} is maximum for m different fromm_k.
Probabilistic silhouette plot
Cristina Tortora
Menardi G. Density-based Silhouette diagnostics for clustering methods.Statistics and Computing, 21, 295-308, 2011.
## Not run: # Asymmetric data set silhouette example (with shape=3). data('asymmetric3') x<-asymmetric3[,-1] fpdas3=FPDC(x,4,3,3) Silh(fpdas3$probability) ## End(Not run) ## Not run: # Asymmetric data set shiluette example (with shape=20). data('asymmetric20') x<-asymmetric20[,-1] fpdas20=FPDC(x,4,3,3) Silh(fpdas20$probability) ## End(Not run) ## Not run: # Shiluette example with outliers. data('outliers') x<-outliers[,-1] fpdout=FPDC(x,4,4,3) Silh(fpdout$probability) ## End(Not run)
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