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Frequent Partial Orders

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Encyclopedia of Database Systems
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Definition

Given a set D of n partial orders on S, and a threshold σ ≤ n, a partial order P is a frequent partial order (FPO) if it is compatible with more than σ partial in D. Typically D contains total orders either on S or arbitrary subsets of S.

Historical Background

A natural extension of association rule mining is to make use of temporal information. This was first done in [1], where the authors present algorithms for mining frequently occurring sequences of sets of items in a database of transactions. Each of such sequences can be seen as a partial order on the complete set of items. For more recent work on the same topic please see [13,8 12]. The slightly different problem of mining frequent episodes from a sequence of events is presented in [7]. In this case an episode is a partial order over the set of all possible events. The problem differs from the one of [1] by considering a stream of events (for example notifications and alerts generated by devices in a...

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Recommended Reading

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Ukkonen, A. (2009). Frequent Partial Orders. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_172

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