flexbeta {optpart} | R Documentation |
Calculate a Flexible-Beta Dendrogram
Description
Calculates Lance and Williams flexible-beta dendrogram with simplified argument
Usage
flexbeta(dis,beta=-0.25,alpha=(1-beta)/2,gamma=0)
Arguments
dis |
a distance or dissimilarity object of class ‘dist’ |
beta |
the Beta coefficient |
alpha |
the Alpha coefficients (assumed equal) |
gamma |
the gamma coefficient |
Details
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.
Value
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.
Author(s)
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
References
Lance, G.N., and W.T. Williams (1966). A General Theory of Classifactory Sorting Strategies, I. Hierarchical Systems. Computer J. *9*, 373-380.
See Also
Examples
data(shoshveg)
dis.bc <- dsvdis(shoshveg,'bray')
flexb <- flexbeta(dis.bc)