dendrify function

Measurement Mapping for an IRTree Model

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

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.

Returns

A data frame with one row per sub-item response

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. https://www.jstatsoft.org/v48/c01/.

Author(s)

Ivailo Partchev

See Also

exogenize

Examples

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