Calculate Differential Item Functioning (DIF) classification table

Classifies each items according to the Jodoin/Gierl criteria for DIF. Currently implemented:

calculate_DIF_classification(responses, model = NULL)

Arguments

responses

A data frame containing the responses to the items.

model

Optional. A dmodel object used to calculate the dscore. If not specified, the function will calculate the D-score using the default key.

Value

A data frame with items and their classification for DIF.

Details

• phase (1 vs 2)

• each country vs others