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## Driemel/2016a: Clustering time series under the Fr\'echet distance

Bibtype Inproceedings Driemel/2016a Driemel, Anne and Krivosija, Amer and Sohler, Christian Krauthgamer, Robert Clustering time series under the Fr\'echet distance Proceedings of the 27th Symposium on Discrete Algorithms (SODA) 766-785 SIAM The Fr\'echet distance is a popular distance measure for curves. We study the problem of clustering time series under the Fr\'echet distance. In particular, we give $(1+\varepsilon)$-approximation algorithms for variations of the following problem with parameters $k$ and $\ell$. Given $n$ univariate time series $P$, each of complexity at most $m$, we find $k$ time series, not necessarily from $P$, which we call \emph{cluster centers} and which each have complexity at most $\ell$, such that (a) the maximum distance of an element of $P$ to its nearest cluster center or (b) the sum of these distances is minimized. Our algorithms have running time near-linear in the input size for constant $\varepsilon$, $k$ and $\ell$. To the best of our knowledge, our algorithms are the first clustering algorithms for the Fr\'echet distance which achieve an approximation factor of $(1+\varepsilon)$ or better. Keywords: time series, longitudinal data, functional data, clustering, Fr\'echet distance, dynamic time warping, approximation algorithms. 2016 SFB876-A2
Url http://epubs.siam.org/doi/10.1137/1.9781611974331.ch55
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