cluster (version 1.4-1)

pluton: Isotopic Composition Plutonium Batches

Description

The pluton data frame has 45 rows and 4 columns, containing percentages of isotopic composition of 45 Plutonium batches.

Usage

data(pluton)

source

Available as pluton.dat in the archive http://win-www.uia.ac.be/u/statis/datasets/clusplot-examples.tar.gz

Details

Note that the percentage of plutonium~242 can be computed from the other four percentages, see the examples.

In the reference below it is explained why it is very desirable to combine these plutonium patches in three groups of similar size.

References

Rousseeuw, P.J. and Kaufman, L and Trauwaert, E. (1996) Fuzzy clustering using scatter matrices, Computational Statistics and Data Analysis 23(1), 135--151.

Examples

data(pluton)

hist(apply(pluton,1,sum), col = "gray") # between 94\% and 100\%
pu5 <- pluton
pu5$Pu242 <- 100 - apply(pluton,1,sum) # the remaining isotope.
pairs(pu5)