VerbAgg2 {irtrees} | R Documentation |
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.
A data matrix with 316 persons, 24 three-category items, and two person covariates (trait anger and gender).
http://bear.soe.berkeley.edu/EIRM/
De Boeck and Wilson (2004), Explanatory Item Response Models, Springer.
str(VerbAgg2)
mapping <- cbind(c(1,1,1), diag(3))
str(VerbAgg2T <- exogenize(VerbAgg2[,-c(1,2)], mapping,
endnode=rep(1:3, 8)))