wood {rrcov}R Documentation

Modified Wood Gravity Dataset

Description

The original data are from Draper and Smith (1966) and were used to determine the influence of anatomical factors on wood specific gravity, with five explanatory variables and an intercept. These data were contaminated by replacing a few observations with outliers.

Usage

data(wood)

Format

A data frame with 20 observations on the following 6 variables.

X1
X1
X2
X2
X3
X3
X4
X4
X5
X5
Y
Y

For convenience, the data sets wood.x, a matrix with the first 5 (independent) variables of the data frame, and wood.y, the numeric vector giving the sixth (dependent) variable, are provided as well.

Source

P. J. Rousseeuw and A. M. Leroy (1987) Robust Regression and Outlier Detection. Wiley, p.243, table 8.

Examples

data(wood)
plot(wood.x)
covMcd(wood.x)
summary(lm.wood <- lm(wood.y ~ wood.x))

[Package rrcov version 0.2-5 Index]