Explaining Interval Sequences by Randomization

Lecturer : 
Jussi Korpela, Finnish Institute of Occupational Health
Event type: 
HIIT seminar
Event time: 
2014-06-02 13:15 to 14:00
Aalto University, Computer Science Building, lecture hall T2

Sequences of events are an ubiquitous form of data. In this paper, we show that it is feasible to present an event sequence as an interval sequence. We show how sequences can be efficiently randomized, how to choose a correct null model and how to use randomizations to derive confidence intervals. Using these techniques, we gain knowledge of the temporal structure of the sequence. Time and Fourier space representations, autocorrelations and arbitrary features can be used as constraints in investigating the data. The methods presented are applied to two real-life datasets; a medical heart interbeat interval dataset and a word dataset from a book. We find that the interval sequence representation and randomization methods provide a powerful way to explore interval sequences and explain their structure.

About the speaker:
I'm research engineer at FIOH. My research interests are related to robust, data-driven statistical analysis and data mining methods. Examples of my recent work include randomization techniques for interval sequences and simultaneous confidence intervals for time series data. I also routinely process EEG/ERP data.

Last updated on 26 May 2014 by Antti Ukkonen - Page created on 26 May 2014 by Antti Ukkonen