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Experiments on the TREC Blog track test set show that both groups of credibility indicators significantly improve retrieval effectiveness ; the best performance is achieved when combining them .
 evaluate for: TREC Blog track test set, credibility indicators; evaluate for: retrieval effectiveness, credibility indicators
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 evaluate for: TREC Blog track test set, credibility indicators; evaluate for: retrieval effectiveness, credibility indicators