The soil dataset contains 108 sample measurements from the wavelength range of 400–2500 nm (visible and near infrared spectrum) published by Rinnan et al.

data(soil)

References

Rinnan, R., & Rinnan, A. (2007). Application of near infrared reflectance (NIR) and fluorescence spectroscopy to analysis of microbiological and chemical properties of arctic soil. Soil biology and Biochemistry, 39(7), 1664--1673.

Examples

data("soil") X <- soil$x y <- soil$som n <- nrow(soil$x) set.seed(1001) samp.idx <- sample(1L:n, round(n * 0.7)) X.cal <- X[samp.idx, ] y.cal <- y[samp.idx] X.test <- X[-samp.idx, ] y.test <- y[-samp.idx]