| octane {rchemo} | R Documentation |
octane
Description
Octane dataset.
Near infrared (NIR) spectra (absorbance) of n = 39 gasoline samples over p = 226 wavelengths (1102 nm to 1552 nm, step = 2 nm).
Samples 25, 26, and 36-39 contain added alcohol (outliers).
Usage
data(octane)Format
A list with 1 component: the matrix X with 39 samples and 226 variables.
Source
K.H. Esbensen, S. Schoenkopf and T. Midtgaard Multivariate Analysis in Practice, Trondheim, Norway: Camo, 1994.
Todorov, V. 2020. rrcov: Robust Location and Scatter Estimation and Robust Multivariate Analysis with High Breakdown. R Package version 1.5-5. https://cran.r-project.org/.
References
M. Hubert, P. J. Rousseeuw, K. Vanden Branden (2005), ROBPCA: a new approach to robust principal components analysis, Technometrics, 47, 64-79.
P. J. Rousseeuw, M. Debruyne, S. Engelen and M. Hubert (2006), Robustness and Outlier Detection in Chemometrics, Critical Reviews in Analytical Chemistry, 36(3-4), 221-242.
Examples
data(octane)
X <- octane$X
headm(X)
plotsp(X, xlab = "Wawelength", ylab = "Absorbance")
plotsp(X[c(25:26, 36:39), ], add = TRUE, col = "red")