mahalanobisT2: Mahalanobis T^2

In mistat: Data Sets, Functions and Examples from the Book: "Modern Industrial Statistics" by Kenett, Zacks and Amberti

Description

Mahalanobis T^2 and Confidence Region

Usage

mahalanobisT2(x, factor.name, response.names = names(x)[!names(x) %in% factor.name], 
conf.level=0.95, compare.to = NA, plot = FALSE)

Arguments

x	a data frame
factor.name	single character indicating column name of the experiment factor to test, the first level is used as a reference
response.names	vector of characters indicating columns names of the responses
conf.level	confidence level for the Confidence Region
compare.to	a vector of length length(response.names) to be compared to the result in terms of Mahalanobis T^2
plot	logical, if TRUE also a plot is produced

Value

a list with components:

coord	matrix with transformed coordinates of variables in response.names
mahalanobis	vector containing Lower Control Region, Center and Upper Control Region of Mahalanobis T^2
mahalanobis.compare	single value, Mahalanobis T^2 of compare.to

Author(s)

Daniele Amberti

References

Kenett, R., Zacks, S. with contributions by Amberti, D. Modern Industrial Statistics: with applications in R, MINITAB and JMP. Wiley.

Tsong et al, (1996).

Examples

data(DISS)

mahalanobisT2(DISS[, c("batch", "min15", "min90")], 
              factor.name="batch", 
              conf.level=0.90,
              compare.to=c(15, 15))

mistat documentation built on May 29, 2017, 7:55 p.m.