ham {lmerTest}

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 4x2 design with 4 samples and 2 information levels. A total of 81 Consumers participated in the study.

Usage

data(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.

Age

numeric: age of Consumer.

References

T. Næs, V. Lengard, S. Bølling Johansen, M. Hersleth (2010) Alternative methods for combining design variables and consumer preference with information about attitudes and demographics in conjoint analysis, Food Quality and Preference, 10-4, 368-378, ISSN 0950-3293, https://doi.org/10.1016/j.foodqual.2009.09.004.

Examples

# Simple model for the ham data:
fm <- lmer(Informed.liking ~ Product*Information + (1|Consumer) , data=ham)

# Anova table for the fixed effects:
anova(fm)

## Not run: 
# Fit 'big' model:
fm <- lmer(Informed.liking ~ Product*Information*Gender*Age +
             + (1|Consumer) + (1|Consumer:Product) +
             (1|Consumer:Information),
           data=ham)
step_fm <- step(fm)
step_fm # Display elimination results
final_fm <- get_model(step_fm)

## End(Not run)