milk {rrcov}R Documentation

Daudin's Milk Composition Data

Description

Daudin et. al. (1988) give 8 readings on the composition of 86 containers of milk. They speak about 85 observations, but this can be explained with the fact that observations 63 and 64 are identical (as noted by Rocke (1996). The data set was used for analysing the stability of principal component analysis by the bootstrap method. In the same context, but using high breakdown point robust PCA, these data was analysed by Todorov et.al. (1994). Atkinson (1994) used these data for ilustration of the forward search algorithm for identifying of multiple outliers.

Usage

data(milk)

Format

A data frame with 86 observations on the following 8 variables.

X1
density
X2
fat content, grams/liter
X3
protein content, grams/liter
X4
casein content, grams/liter
X5
cheese dry substance measured in the factory, grams/liter
X6
cheese dry substance measured in the laboratory, grams/liter
X7
milk dry substance, grams/liter
X8
cheese product, grams/liter

Source

Daudin, J.J. Duby, C. and Trecourt, P. (1988) Stability of Principal Component Analysis Studied by the Bootstrap Method Statistics 19 241-258.

Examples

data(milk)
covMcd(milk)

[Package rrcov version 0.2-5 Index]