Ranking uncertain sky: The probabilistic top-k skyline operator

Publisher:
Elsevier
Publication Type:
Journal Article
Citation:
Information Systems, 2011, 36 (5), pp. 898 - 915
Issue Date:
2011-01
Full metadata record
Files in This Item:
Filename Description Size
Thumbnail2013005445OK.pdf994.08 kB
Adobe PDF
Many recent applications involve processing and analyzing uncertain data. In this paper, we combine the feature of top-k objects with that of skyline to model the problem of top-k skyline objects against uncertain data. The problem of efficiently computing top-k skyline objects on large uncertain datasets is challenging in both discrete and continuous cases. In this paper, firstly an efficient exact algorithm for computing the top-k skyline objects is developed for discrete cases. To address applications where each object may have a massive set of instances or a continuous probability density function, we also develop an efficient randomized algorithm with an @e@?approximation guarantee. Moreover, our algorithms can be immediately extended to efficiently compute p-skyline; that is, retrieving the uncertain objects with skyline probabilities above a given threshold. Our extensive experiments on synthetic and real data demonstrate the efficiency of both algorithms and the randomized algorithm is highly accurate. They also show that our techniques significantly outperform the existing techniques for computing p-skyline.
Please use this identifier to cite or link to this item: