R Dataset / Package cluster / pluton
On this Picostat.com statistics page, you will find information about the pluton data set which pertains to Isotopic Composition Plutonium Batches. The pluton data set is found in the cluster R package. Try to load the pluton data set in R by issuing the following command at the console data("pluton"). This may load the data into a variable called pluton. If R says the pluton data set is not found, you can try installing the package by issuing this command install.packages("cluster") and then attempt to reload the data with library("cluster") followed by data("pluton"). Perhaps strangley, if R gives you no output after entering a command, it means the command succeeded. If it succeeded you can see the data by typing pluton at the command-line which should display the entire dataset.
If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the pluton R data set. The size of this file is about 1,184 bytes.
Isotopic Composition Plutonium Batches
This data frame contains the following columns:
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.
Available as ‘pluton.dat’ from the archive of the University of Antwerpen, ‘..../datasets/clusplot-examples.tar.gz’, no longer available.
Rousseeuw, P.J. and Kaufman, L and Trauwaert, E. (1996) Fuzzy clustering using scatter matrices, Computational Statistics and Data Analysis 23(1), 135–151.
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)
Dataset imported from https://www.r-project.org.
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