R Dataset / Package MASS / Skye
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On this R-data statistics page, you will find information about the Skye data set which pertains to AFM Compositions of Aphyric Skye Lavas. The Skye data set is found in the MASS R package. You can load the Skye data set in R by issuing the following command at the console data("Skye"). This will load the data into a variable called Skye. If R says the Skye data set is not found, you can try installing the package by issuing this command install.packages("MASS") and then attempt to reload the data. 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 Skye R data set. The size of this file is about 214 bytes. AFM Compositions of Aphyric Skye LavasDescriptionThe UsageSkye FormatThis data frame contains the following columns:
SourceR. N. Thompson, J. Esson and A. C. Duncan (1972) Major element chemical variation in the Eocene lavas of the Isle of Skye. J. Petrology, 13, 219–253. ReferencesJ. Aitchison (1986) The Statistical Analysis of Compositional Data. Chapman and Hall, p.360. Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer. Examples# ternary() is from the on-line answers. ternary <- function(X, pch = par("pch"), lcex = 1, add = FALSE, ord = 1:3, ...) { X <- as.matrix(X) if(any(X < 0)) stop("X must be non-negative") s <- drop(X %*% rep(1, ncol(X))) if(any(s<=0)) stop("each row of X must have a positive sum") if(max(abs(s-1)) > 1e-6) { warning("row(s) of X will be rescaled") X <- X / s } X <- X[, ord] s3 <- sqrt(1/3) if(!add) { oldpty <- par("pty") on.exit(par(pty=oldpty)) par(pty="s") plot(c(-s3, s3), c(0.5-s3, 0.5+s3), type="n", axes=FALSE, xlab="", ylab="") polygon(c(0, -s3, s3), c(1, 0, 0), density=0) lab <- NULL if(!is.null(dn <- dimnames(X))) lab <- dn[[2]] if(length(lab) < 3) lab <- as.character(1:3) eps <- 0.05 * lcex text(c(0, s3+eps*0.7, -s3-eps*0.7), c(1+eps, -0.1*eps, -0.1*eps), lab, cex=lcex) } points((X[,2] - X[,3])*s3, X[,1], ...) }ternary(Skye/100, ord=c(1,3,2)) -- Dataset imported from https://www.r-project.org. |
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Attachment | Size |
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dataset-20551.csv | 214 bytes |