robustbase (version 0.5-0-1)

phosphor: Phosphorus Content Data

Description

This dataset investigates the effect from inorganic and organic Phosphorus in the soil upon the phosphorus content of the corn grown in this soil, from Prescott (1975).

Usage

data(phosphor)

source

P. J. Rousseeuw and A. M. Leroy (1987) Robust Regression and Outlier Detection. Wiley, p.156, table 24.

Examples

data(phosphor)
plot(phosphor)
summary(lm.phosphor <- lm(plant ~ ., data = phosphor))
summary(lts.phosphor <- ltsReg(plant ~ ., data = phosphor))

phosphor.x <- data.matrix(phosphor[, 1:2])
cPh <- covMcd(phosphor.x)
plot(cPh, "dd")