woodmod.dat {robust}

Modified Wood Data

Description

The explanatory variables from the Modified Data on Wood Specific Gravity analyzed in Rousseeuw and Leroy (1987).

Note that data(wood, package="robustbase") contains the same data, and additionally the y-variable.

Usage

  data(woodmod.dat)

Format

This data frame contains the following variables:

V1

number of fibers per square milimeter in Springwood (coded by dividing by 1000).

V2

number of fibers per square milimeter in Summerwood (coded by dividing by 10000).

V3

fraction of Springwood.

V4

fraction of light absorption by Springwood.

V5

fraction of light absorption by Summerwood.

Source

Rousseeuw, P. J., and Leroy, A. M. (1987). Robust Regression and Outlier Detection. New York: Wiley.

Examples

  data(woodmod.dat)
  woodmod.dat

  data(wood, package = "robustbase")
  stopifnot(data.matrix(woodmod.dat) ==
            data.matrix(wood [,1:5]))