lmerTest (version 2.0-32)

ham: Conjoint study of dry cured ham

Description

One of the purposes of the study was to investigate the effect of information given to the consumers measured in hedonic liking for the hams. Two of the hams were Spanish and two were Norwegian, each origin representing different salt levels and different aging time. The information about origin was given in such way that both true and false information was given. essentially a 4*2 design with 4 samples and 2 information levels. A total of 81 Consumers participated in the study.

Usage

ham

Format

Consumer

factor with 81 levels: numbering identifying consumers

Product

factor with four levels

Informed.liking

numeric: hedonic liking for the products

Information

factor with two levels

Gender

factor with two levels (gender)

Age

numeric: age of Consumer

References

"Alternative methods for combining design variables and consumer preference with information about attitudes and demographics in conjoint analysis" . T. Naes, V.Lengard, S. Bolling Johansen, M. Hersleth

Examples

#import lmerTest package
library(lmerTest)

m <- lmer(Informed.liking ~ Product*Information*Gender 
+ (1|Product:Consumer) , data=ham)

#anova table with p-values with Satterthwaite's approximation for denominator 
#degrees of freedom
anova(m)

#analysis of random and fixed parts and post hoc 
#analysis of Product and Information effects
step(m, reduce.random=FALSE, reduce.fixed=FALSE,
test.effs=c("Product", "Information"))