irtrees (version 1.0.0)

VerbAgg3: Verbal Aggression Data, Three-Category Items

Description

Item responses to a questionaire on verbal aggression. These data are used throughout De Boeck and Wilson, Explanatory Item Response Models (Springer, 2004) to illustrate various forms of item response models.

Format

A data matrix with 316 persons, 24 three-category items, and two person covariates (trait anger and gender).

References

De Boeck and Wilson (2004), Explanatory Item Response Models, Springer.

Examples

# NOT RUN {
str(VerbAgg3)
mapping <- cbind(c(0,1,1), c(NA,0,1))
str(VerbAgg3T <- dendrify(VerbAgg3[,-c(1,2)], mapping))
# }