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Table 8 Reasons for item overfit

From: Calibrating the CEFR against the China Standards of English for College English vocabulary education in China

ID Descriptor wording Level Reason for overfit
V39 Has a good command of over 5,000 words C1-CSE8 Level agreement
V21 Can produce synonyms of basic words in different contexts B1-CSE5 Level agreement
V22 Can produce synonyms of most common words in different contexts B2-CSE7 Interdependency
V25 Can produce antonyms of most common words in different contexts B2-CSE7 Interdependency