From: Linking the International English Language Competency Assessment suite of examinations to the Common European Framework of Reference
Logits
Infit
Outfit
Notes
Less than .50
Ni Ma Ek Ja
Insufficient variation
Between .50 and 1.50
Ol Tr Em Ro So Mar Ra Jo Ca
Ol Tr Em Ro So Ra Jo Ca
appropriate variation
Larger than 1.50
Sa
Sa Jo Ma
Central tendency or halo effect