Measurement Mapping for an IRTree Model

Description

Expands a wide-form matrix of item responses to a long-form data frame of sub-item responses

Usage

1
dendrify(mat, cmx)

Arguments

mat

An integer matrix of IRT responses (columns represent items, rows represent respondents)

cmx

A mapping matrix with as many rows as there are response options for the items.

Value

A data frame with one row per sub-item response

Author(s)

Ivailo Partchev

References

De Boeck, P. and Partchev, I. (2012). IRTrees: Tree-Based Item Response Models of the GLMM Family, Journal of Statistical Software – Code Snippets, 48(1), 1–28. http://www.jstatsoft.org/v48/c01/.

See Also

exogenize

Examples

1
2
mapping <- cbind(c(0,1,1), c(NA,0,1))
str(linrespT <- dendrify(linresp, mapping))