fit_domains function

Estimate the Rasch and the Interaction model per domain

Estimate the parameters of the Rasch model and the Interaction model

fit_domains(dataSrc, item_property, predicate = NULL)

Arguments

• dataSrc: a connection to a dexter database or a data.frame with columns: person_id, item_id, item_score
• item_property: The item property defining the domains (subtests)
• predicate: An optional expression to subset data, if NULL all data is used

Returns

An object of class imp holding results for the Rasch model and the interaction model.

Details

We have generalised the interaction model for items having more than two (potentially, a largish number) of response categories. This function represents scores on subtests as super-items and analyses these as normal items.

Examples

db = start_new_project(verbAggrRules, ":memory:")
add_booklet(db, verbAggrData, "agg")
add_item_properties(db, verbAggrProperties)
mSit = fit_domains(db, item_property= "situation")
plot(mSit)

close_project(db)

See Also

plot.inter, fit_inter, add_item_properties