robustbase: pulpfiber – R documentation

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pulpfiber

Pulp Fiber and Paper Data

Description

Measurements of aspects pulp fibers and the paper produced from them. Four properties of each are measured in sixty-two samples.

Usage

data(pulpfiber, package="robustbase")

Format

A data frame with 62 observations on the following 8 variables.

X1: numeric vector of arithmetic fiber length
X2: numeric vector of long fiber fraction
X3: numeric vector of fine fiber fraction
X4: numeric vector of zero span tensile

Y1: numeric vector of breaking length
Y2: numeric vector of elastic modulus
Y3: numeric vector of stress at failure
Y4: numeric vector of burst strength

Details

Cited from the reference article: The dataset contains measurements of properties of pulp fibers and the paper made from them. The aim is to investigate relations between pulp fiber properties and the resulting paper properties. The dataset contains n = 62 measurements of the following four pulp fiber characteristics: arithmetic fiber length, long fiber fraction, fine fiber fraction, and zero span tensile. The four paper properties that have been measured are breaking length, elastic modulus, stress at failure, and burst strength.

The goal is to predict the q = 4 paper properties from the p = 4 fiber characteristics.

Author(s)

port to R and this help page: Martin Maechler

Source

Rousseeuw, P. J., Van Aelst, S., Van Driessen, K., and Agulló, J. (2004) Robust multivariate regression; Technometrics 46, 293–305.

Till 2016 available from http://users.ugent.be/~svaelst/data/pulpfiber.txt

References

Lee, J. (1992) Relationships Between Properties of Pulp-Fibre and Paper, unpublished doctoral thesis, U. Toronto, Faculty of Forestry.

Examples

data(pulpfiber)
str(pulpfiber)

pairs(pulpfiber, gap=.1)
## 2 blocks of 4 ..
c1 <- cov(pulpfiber)
cR <- covMcd(pulpfiber)
## how different are they: The robust estimate has more clear high correlations:
symnum(cov2cor(c1))
symnum(cov2cor(cR$cov))

robustbase

Basic Robust Statistics

v0.93-7

GPL (>= 2)

Authors

Martin Maechler [aut, cre] (<https://orcid.org/0000-0002-8685-9910>), Peter Rousseeuw [ctb] (Qn and Sn), Christophe Croux [ctb] (Qn and Sn), Valentin Todorov [aut] (most robust Cov), Andreas Ruckstuhl [aut] (nlrob, anova, glmrob), Matias Salibian-Barrera [aut] (lmrob orig.), Tobias Verbeke [ctb, fnd] (mc, adjbox), Manuel Koller [aut] (mc, lmrob, psi-func.), Eduardo L. T. Conceicao [aut] (MM-, tau-, CM-, and MTL- nlrob), Maria Anna di Palma [ctb] (initial version of Comedian)

Initial release

2021-01-04