Calculate a Flexible-Beta Dendrogram
Calculates Lance and Williams flexible-beta dendrogram with simplified argument
flexbeta(dis,beta=-0.25,alpha=(1-beta)/2,gamma=0)
dis |
a distance or dissimilarity object of class ‘dist’ |
beta |
the Beta coefficient |
alpha |
the Alpha coefficients (assumed equal) |
gamma |
the gamma coefficient |
Calculates a flexible-beta dendrogram from a dissimilarity matrix specifying
minimum parameters. The routine is simply a wrapper for the
agnes function from package cluster
with suitable arguments specified to
achieve desired results. Ecologist in particular (but many others) find beta = -0.25
a good default.
An object of class ‘hclust’ for plotting and analysis like other
hclust objects, as compared to objects of class ‘agnes’ as generated by the
agnes function in package cluster.
for the agnes function, Peter Rousseeuw for the original Fortran, Martin Maechler for the R code
for this function, David W. Roberts droberts@montana.edu
Lance, G.N., and W.T. Williams (1966). A General Theory of Classifactory Sorting Strategies, I. Hierarchical Systems. Computer J. *9*, 373-380.
data(shoshveg) dis.bc <- dsvdis(shoshveg,'bray') flexb <- flexbeta(dis.bc)
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