cutree {mva}

R Documentation

Cut a tree into groups of data

Description

Cuts a tree, e.g., as resulting from hclust, into several groups either by specifying the desired number of groups or the cut height.

Usage

cutree(tree, k=NULL, h=NULL)

Arguments

tree	a tree as produced by hclust
k	an integer scalar or vector with the desired number of groups
h	numeric scalar or vector with heights where the tree should be cut.

At least one of k or h must be specified, k overrides h if both are given.

Value

cutree returns a vector with group memberships if k or h are scalar, otherwise a matrix with group meberships is returned where each column corresponds to the elements of k or h, respectively (which are also used as column names).

See Also

hclust

Examples

require(mva)
data(USArrests)

hc <- hclust(dist(USArrests))

cutree(hc, k=1:5)#k = 1 is trivial
cutree(hc, h=250)

## Compare the 2 and 3 grouping:
g24 <- cutree(hc, k = c(2,4))
table(g24[,"2"], g24[,"4"])