phosphor {rrcov} | R Documentation |
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).
data(phosphor)
A data frame with 18 observations on the following 3 variables.
X1
X2
Y
For convenience, the data sets phosphor.x
, a matrix with the first two (independent) variables of the data frame, and phosphor.y
, the numeric vector giving the thirth (dependent) variable, are provided as well.
P. J. Rousseeuw and A. M. Leroy (1987) Robust Regression and Outlier Detection. Wiley, p.156, table 24.
data(phosphor) plot(phosphor.x) covMcd(phosphor.x) summary(lm.phosphor <- lm(phosphor.y ~ phosphor.x))