This is especially handy for converting IRT models with less parameters (such as 1 parameter logistic model) to higher dimensional models such as three parameter logistic model.
convert_model(ip, target_model = "3PL")# S4 method for Item
convert_model(ip, target_model = "3PL")
# S4 method for Itempool
convert_model(ip, target_model = "3PL")
# S4 method for Testlet
convert_model(ip, target_model = "3PL")
An Item-class
or Itempool-class
object
The target model that the conversion will be made.
An 'Item' object with new model parameters will be returned.