salad {prefmod}R Documentation

Data (ranks): Salad Dressings (Critchlow and Fligner)

Description

The data frame shows the ranking of four salad dressing concerning tartness by 32 judges, whereas (1) is assigned as most tart and (4) is assigned as least tart.

Usage

data(salad)

Format

A
salad dressing preperation A
B
salad dressing preperation B
C
salad dressing preperation C
D
salad dressing preperation D

References

Douglas E. Crichtlow and Michael A. Fligner (1991), Paired Comparison, Triple Comparison, and Ranking Expermients As Generalized Linear Models, and Their Implementation on GLIM. Psychometrika Vol. 56, No. 3

Examples

# Example for object covariates
# fit object covariates:
# salads A - D have varying concentrations of acetic and gluconic acid.
# The four pairs of concentrations are
# A = (.5, 0), B = (.5, 10.0), C = (1.0, 0), and D = (0, 10.0),
data(salad)
conc<-matrix(c(.5,0, .5,10,  1,0, 0,10), nc=2, byrow=TRUE)
sal<-patt.design(salad,nitems=4,resptype="ranking")
X<-as.matrix(sal[,2:5])
glm(y~X,family=poisson,data=sal)

[Package prefmod version 0.8-13 Index]