A summary of the study on probabilistic threshold top-k queries on uncertain data and evaluation algorithms. More details can be found in the following two papers:
[1] M. Hua, J. Pei, W. Zhang, and X. Lin. "Efficiently Answering Probabilistic Threshold Top-k Queries on Uncertain Data". In Proceedings of the 24th International Conference on Data Engineering (ICDE'08), Cancún, México, April 7-12, 2008.
http://www.cs.sfu.ca/~mhua/personal/publications/ProbabilisticTopK-ICDE08.pdf
[2] M. Hua, J. Pei, W. Zhang, and X. Lin. "Ranking Queries on Uncertain Data: A Probabilistic Threshold Approach". In Proceedings of the 2008 ACM SIGMOD International Conference on Management of Data (SIGMOD'08), June 11-14, 2008, Vancouver, Canada.
http://www.cs.sfu.ca/~mhua/personal/publications/uncertaintopk_sigmod08.pdf
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