Abstract
In the dynamic scenarios faced nowadays, when handling non stationary data streams it is of utmost importance to perform change detection tests. In this work, we propose the Intrinsic Page Hinkley Test (iPHT), which enhances the Page Hinkley Test (PHT) eliminating the user-defined parameter (the allowed magnitude of change of the data that are not considered real distribution change of the data stream) by using the second order intrinsic mode function (IMF) which is a data dependent value reflecting the intrinsic data variation. In such way, the PHT change detection method is expected to be more robust and require less tunes. Furthermore, we extend the proposed iPHT to a blockwise approach. Computing the IMF over sliding windows, which is shown to be more responsive to changes and suitable for online settings. The iPHT is evaluated using artificial and real data, outperforming the PHT.
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Acknowledgments
This work was supported by the Portuguese Science Foundation (FCT) through national funds, and co-funded by the FEDER, within the PT2020 Partnership Agreement and COMPETE2020 under projects IEETA (UID/CEC/00127/2013) and VR2market (funded by the CMU Portugal program, CMUP-ERI/FIA/0031/2013). Raquel Sebastião acknowledges her Post-Doc grant (BPD/UI62/6777/2015).
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Sebastião, R., Fernandes, J.M. (2017). Supporting the Page-Hinkley Test with Empirical Mode Decomposition for Change Detection. In: Kryszkiewicz, M., Appice, A., Ślęzak, D., Rybinski, H., Skowron, A., Raś, Z. (eds) Foundations of Intelligent Systems. ISMIS 2017. Lecture Notes in Computer Science(), vol 10352. Springer, Cham. https://doi.org/10.1007/978-3-319-60438-1_48
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DOI: https://doi.org/10.1007/978-3-319-60438-1_48
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