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cs.DB2014
Estimating the pattern frequency spectrum inside the browser
Matthijs van Leeuwen, Antti Ukkonen
We present a browser application for estimating the number of frequent patterns, in particular itemsets, as well as the pattern frequency spectrum. The pattern frequency spectrum i…
cs.DB2010
Approximate Top-k Retrieval from Hidden Relations
Antti Ukkonen
We consider the evaluation of approximate top-k queries from relations with a-priori unknown values. Such relations can arise for example in the context of expensive predicates, or…