Hello,
I am doing clustering and I want to know how can i find Silhouette width
using K-means. Just like PAM (code below).
(2) Secondly, I have mixed data all sort of variables numeric, categorical,
nominals so I first change to all nominal to binary and
normlise the data before any clustering. Is there any other elegant way of
doing this?
(3) another question how to normlise and change to binary (filters) in R?
Thank you in Advance.
ravi
Examples(PAM)
## Use the silhouette widths for assessing the best number of clusters,
## following a one-dimensional example from Christian Hennig :
##
x <- c(rnorm(50), rnorm(50,mean=5), rnorm(30,mean=15))
asw <- numeric(20)
## Note that "k=1" won't work!
for (k in 2:20)
asw[k] <- pam(x, k) $ silinfo $ avg.width
k.best <- which.max(asw)
cat("silhouette-optimal number of clusters:", k.best, "\n")
plot(1:20, asw, type= "h", main = "pam() clustering
assessment",
xlab= "k (# clusters)", ylab = "average silhouette
width")
axis(1, k.best, paste("best",k.best,sep="\n"), col =
"red", col.axis "red")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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