Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Frequent Partial Orders

  • Antti UkkonenEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_172


Given a set D of n partial orders on S, and a threshold σn, 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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Helsinki University of TechnologyHelsinkiFinland

Section editors and affiliations

  • Jian Pei
    • 1
  1. 1.School of Computing ScienceSimon Fraser Univ.BurnabyCanada