Statistical significance

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178 document collections with different sets of queries then we can still use these measures to indicate which system satisfies the user more ...Significance tests Once we have our retrieval effectiveness figures we may wish to establish that the difference in effectiveness under two conditions is statistically significant ...Parametric tests are inappropriate because we do not know the form of the underlying distribution ...On the face of it non parametric tests might provide the answer ...
10 In the past there has been much debate about the validity of evaluations based on relevance judgments provided by erring human beings ...Effectiveness and efficiency Much of the research and development in information retrieval is aimed at improving the effectiveness and efficiency of retrieval ...