LearningtoEstimateQueryDifficulty IncludingApplicationstoMissingContentDetectionandDistributedInformationRetrievalEladYom-Tov,ShaiFine,DavidCarmel,AdamDarlowIBMHaifaResearchLabsSIGIR2005穷惦销仟拉粗信哄森久近谗则秘弘我够认盲戎纱者牲聚慑份晶篡未峪谬掩(局外人)(局外人)-,includingimprovementofretrieval,detectingqueriesforwhichnorelevantcontentexistsinthedocumentcollection,(局外人)(局外人)2Introduction(1/2)“difficult”,(局外人)(局外人)3Introduction(2/2)Theobservationandmotivation::(局外人).ATRECqueryforexample:“Whatimpacthasthechunnel(水底隧道)hadontheBritisheconomyand/orthelifestyleoftheBritish”合舆嫌巴村判厌慰伍蠢杀煮握淹疟诸妻岁促表代篷庭犁榨槛婉建拧远淘争(局外人)(局外人)4RelatedWork(1/2)IntheRobusttrackofTREC2004,-:Measuringclaritybasedonthesystem’sscoreofthetopresultsAnalyzingtheambiguityofthequerytermsLearningapredictorusingoldTRECtopicsastrainingdata(Ounis,2004)showedthatIDF-basedpredictorispositivelyrelatedtoqueryprecis
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