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This paper is focused on the effect of correlation on data fusion for multiple retrieval results. If some of the retrieval results involved in data fusion correlate more strongly than the others, their common opinion will dominate the voting process in data fusion. This may degrade the effectiveness of data fusion in many cases, especially when very good results appear to be a minority. For solving this problem, we assign each result a weight, which is derived from the correlation coefficient of that result to the other results, then the linear combination method can be used for data fusion. The evaluation of the effectiveness of the proposed method with TREC 5 ( ad hoc track) results is reported. Furthermore, we explore the relationship between results correlation and data fusion by some experiments, and demonstrate that a relationship between them does exists.