[Statlist] RESEARCH SEMINAR IN STATISTICS - UNIVERSITY OF GENEVA

[Eva Cantoni]

RESEARCH SEMINAR IN STATISTICS - UNIVERSITY OF GENEVA

Organisers : .
E. Cantoni - E. Ronchetti - S. Sperlich - M-P. Victoria-Feser

Friday May 9th, 2014
at 11h15
Room M 5220, Uni Mail (40, bd du Pont-d'Arve)

Sara Sjöstedt de Luna
Umeå University, Sweden

"Modelling varved lake sediment to detect past climate changes using 
functional data analysis"

Abstract:
A functional data analysis (FDA) approach to analyse historical archives 
such as annually laminated (varved) lake sediments is suggested, with 
the aim of reconstructing past environment and climate changes. Varved 
lake sediment has inherent (within-year) seasonal patterns that are 
expected to contain valuable information about past (seasonal) climate, 
with similar profiles corresponding to similar climatic conditions. 
Image analysis is used to generate the observed data of yearly seasonal 
profiles in terms of a sequence of grey-scale pixel variation. We 
present FDA methods to cluster the seasonal patterns of the varves 
(years) into homogeneous groups. The possibility to improve the 
clustering of the varves by incorporating covariates, time warping and 
time dependence between years will be discussed. The ideas are 
illustrated on varved lake sediment data from the lake Kassjön (N. 
Sweden) covering the past >6400 years.


Visit the website: http://www.stat-center.unige.ch/ResSem.html

-- 
Prof. Eva Cantoni
Research Center for Statistics and
      Geneva School of Economics and Management
University of Geneva, Bd du Pont d'Arve 40, CH-1211 Genève 4
http://www.unige.ch/ses/dsec/staff/faculty/Cantoni-Eva.html