| cluinf {lmomRFA} | R Documentation |
Agglomerative hierarchical clustering procedures typically produce
a list of the clusters merged at each stage of the clustering.
cluinf uses this list to construct arrays that explicitly show
which cluster a given data point belongs to, and which data points belong
to a given cluster.
cluinf(merge, nclust)
merge |
Matrix with 2 columns. The ith row contains
the labels of the clusters merged at the ith merge.
Can also be the object returned by a call to cluagg. |
nclust |
Number of clusters. |
Information about the clustering that has nclust clusters.
It is a list with the following elements:
assign |
Vector giving the assignment of items to clusters. |
list |
List with nclust elements. Each element contains
the labels of the items in one cluster. |
num |
Vector of length nclust, containing the
number of items in each cluster. |
J. R. M. Hosking hosking@watson.ibm.com
Hosking, J. R. M., and Wallis, J. R. (1997). Regional frequency analysis: an approach based on L-moments. Cambridge University Press.
## Clustering of gaging stations in Appalachia, as in Hosking
## and Wallis (1997, sec. 9.2.3)
data(Appalach)
# Form attributes for clustering (Hosking and Wallis's Table 9.4)
att <- cbind(a1 = log(Appalach$area),
a2 = sqrt(Appalach$elev),
a3 = Appalach$lat,
a4 = Appalach$long)
att <- apply(att, 2, function(x) x/sd(x))
att[,1] <- att[,1] * 3
# Clustering by Ward's method
(cl<-cluagg(att))
# Details of the clustering with 7 clusters
cluinf(cl, 7)