12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Efficient detection of multiple changepoints wi...
View graph of relations

« Back

Efficient detection of multiple changepoints within an oceanographic time series

Research output: Contribution in Book/Report/ProceedingsPaper

Published

Publication date2011
Host publicationProceedings of the 58th Session of ISI
PublisherISI
Number of pages6
Original languageEnglish

Abstract

We consider the problem of detecting multiple changepoints in large oceanographic data sets. In this setting the amount of data being collected is continually increasing and consequently the number of changepoints will also increase with time. An efficient and accurate analysis of such data is of considerable interest to those working in the energy sector as understanding the characteristics of the ocean environment is central to reliable design and operation of marine and coastal structures. Detecting the presence of changepoints in oceanographic time-series is of particular importance, since statistical and engineering modelling of the ocean environment, structural loading and response typically assumes stationarity of the environment (in time). Drawing on recent work on efficient search methods by Killick et al. (2011), we compare and contrast the eff_ect of diff_erent approaches to this data, focusing in particular on computational and statistical aspects. The talk will conclude by highlighting the importance of such computationally efficient methods in an oceanographic setting.