Collective suffix tree-based models for location prediction

Eldaw, Muawya Habib Sarnoub and Levene, Mark and Roussos, George (2013) Collective suffix tree-based models for location prediction. In: UNSPECIFIED (ed.) UbiComp '13: Adjunct Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication. New York, U.S.: Association for Computing Machinery, pp. 441-450. ISBN 9781450322157.

Abstract

Models developed for the prediction of location, where a specific individual will be present at a future time, are typically implemented using a one-model-per-user approach which cannot be employed for inferring collective or social behaviours involving other individuals. In this paper, we propose an alternative that allows for inference though a collaborative mechanism which does not require the profiling of individual users. This alternative utilises a suffix tree as its core underlying data structure, where predictions are computed over an aggregate record of behaviours of all users. We evaluate the performance of our model on the Nokia Mobile Data Collection Campaign data set and find that the collective approach performs well compared to individual user models. We also find that the commonly used Hit and Miss score on its own does not provide sufficient indication of prediction accuracy, and that employing additional metrics using the mean error may be preferable.

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