Speaker: Joss Langford Presentation: Event based classification of
Speaker: Joss Langford Presentation: Event based classification of human behaviour Date: Tuesday 16th September 2014 Session: (4) Business Applications of R Time: 1330 1500 hrs 1500 hrs Place: Tower Suite 3 Event based classification of human behaviour: strategic commercial use of open source tools GENEActiv
Activinsights specialises in the science of behavioural measurement with the aim of benefiting peoples overall health GENEActiv wrist-worn accelerometers are the device of choice for studies at many of the worlds leading universities, hospitals and professional sports bodies The original open raw data accelerometer giving uncompressed data in SI units Activinsights Limited 2014 Strategic Commercial - Open
Background: GENEActiv is a general purpose instrument specialisation comes at the software & analysis stage Our customers often produce large data sets up to 10,000 subjects at 0.5Gb each GENEActiv is largely used in research (academic & commercial) Open source tools allow us to: Support a huge range of applications without significant business risk and overhead Collaborate with academics and other commercial partners Provide referenced open releases of tools via CRAN Activinsights Limited 2014 Impact Many studies and most large national studies now use raw data in SI units often GENEActiv & GENEAread Examples: General behaviour
Sports Sleep Visualisation Algorithms American Journal of Epidemiology AssociationSleep Between Questionnaire- and Journal Accelerometer-Assessed Physical Activity: The Role of Sociodemographic Estimates Using Factors JournalSleep of Applied Physiology Microelectromechanical Systems (MEMS)
Auto-calibration of accelerometer data CRAN: for GGIR free-living physical activity assessment using local gravity and temperature: an evaluation on four continents CRAN: GENEAsphere CRAN: GGIR Activinsights Limited 2014 Event-based classification While we have been successful moving the industry to SI units we still have work to do in the area of fixed epoch summaries
Large time-series data sets are not intuitive for human handling Nearly all our customers use fixed epoch summaries but variable length event-based summaries have many advantages Is it a classification or a changepoint problem? There is a natural granularity of everyday life Activinsights Limited 2014 Coelition
Coelition is an open standards organisation that is developing a standard to help classify everyday living The Classification of Everyday Living (COEL) is a hierarchical taxonomy with 32 top level clusters - currently coding over 7,000 behavioural events The hierarchical structure allows information from different sources to be recorded in the same framework Activinsights Limited 2014
Raw data view of a morning Accelerometer Activinsights Limited 2014 Event-based view Accelerometer Diary child woke during night got up sleep
Simple phone app bought coffee drove to station train to London phone screen on location 1 location 2 location 3 Activinsights Limited 2014 Future challenges
Using GENEAclassify as a starting point, build our abilities to intelligently analyse raw data accelerometry Develop better deployment tools e.g. file handling, parallelisation and interfacing Develop new tools for the analysis of event-based data e.g. sequence analysis Activinsights Limited 2014 Acknowledgements & information
Zhou Fang, Biomathematics & Statistics Scotland Sverine Sabia, University College London Vincent van Hees, Newcastle University John Bardon, University of Regina Alex Rowlands, University of South Australia Matt Reed, Coelition [email protected] Activinsights Limited 2014
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