eatATA (version 1.1.2)

stemInclusionTuples: Create item inclusion tuples from item stem.

Description

If item-stimulus hierarchies are stored in a single stimulus column, stemInclusionTuples transforms this format into item pairs ('tuples').

Usage

stemInclusionTuples(items, idCol = "ID", stemCol)

Value

A data.frame with two columns.

Arguments

items

A data.frame with information on an item pool.

idCol

character or integer indicating the item ID column in items.

stemCol

A column in items containing the item stems or stimulus names, shared among items which should be in the same test form.

Details

Inclusion tuples can be used by itemInclusionConstraint to set up inclusion constraints.

Examples

# Example data.frame
inclDF <- data.frame(ID = paste0("item_", 1:6),
          stem = c(rep("stim_1", 3), "stim_3", "stim_4", "stim_3"),
          stringsAsFactors = FALSE)

# Create tuples
stemInclusionTuples(inclDF, idCol = "ID", stemCol = "stem")