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...Draft april cambridgeuniversitypress feedbackwelcome evaluationininformation retrieval wehaveseenintheprecedingchaptersmanyalternativesindesigninganir system how do we know which of these techniques are effective in applications should use stop lists stem verse document frequency weighting information has developed asahighlyempiricaldiscipline requiringcarefulandthoroughevaluationto demonstratethesuperiorperformanceofnoveltechniquesonrepresentative documentcollections this chapter begin with a discussion measuring the effectiveness ir systems section and test collections that most often used for purpose then present straightforward notion relevant nonrelevant documents formal evaluation methodol ogy been evaluating unranked results sec tion includes explaining kinds measures standardly related tasks like text clas sication why they appropriate extend notions developfurthermeasuresforevaluatingrankedretrievalresults anddiscussdevelopingreliableandinformativetestcollections wethenstepbac...