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Workshop on spatial statistics (SAMOS, 2007)
par Université Paris 1 Panthéon-Sorbonne
Ce workshop organisé sur une journée était consacré aux modèles spatio et spatio temporels. Six chercheurs étrangers de renommée internationale dans le domaine, ont été invités : N. Cressie, M. Genton, C. Glasbey, V. Isham, S. Richardson, H. Rue. Le thème plus précis du workshop était sur la modélisation hiérarchique à l'aide de processus latents. Les exposés ont abordé aussi bien les problèmes théoriques que les aspects méthodologiques, avec applications à des données réelles. Les supports de présentation sont disponibles sur l'Espace pédagogique interactif…
Épisodes
01 - Predicting spatial exceedance regions - Noël Cressie
11 janv. 2009 · 44 min
In geostatistics, a common problem is to predict a spatial exceedance and its exceedance region. This is scientifically important since unusual events tend to strongly impact the environment. Here, we use classes of loss functions based on image metrics (e.g., Baddeley's loss function) to predict…
02 - Questions - Noël Cressie
11 janv. 2009 · 10 min
Noël Cressie - Ohio State University Bande son disponible au format mp3 Durée : 10 mn
03 - Modelling and testing properties of space-time covariance functions - Marc Genton
11 janv. 2009 · 45 min
Modeling space-time data often relies on parametric covariance models and various assumptions such as full symmetry and separability. These assumptions are important because they simplify the structure of the model and its inference, and ease the possibly extensive computational burden associated…
04 - Questions - Marc Genton
23 avr. 2007 · 5 min
Marc Genton - University of Geneva Bande son disponible au format mp3 Durée : 5 mn
05 - Spatio-temporal weather models - Chris Glasbey
22 avr. 2007 · 50 min
We develop contrasting spatio-temporal models for two weather variables: solar radiation and rainfall. For solar radiation the aim is to assess the performance of area networks of photo-voltaic cells. Although radiation measured at a sufficiently fine temporal scale has a bimodal marginal…
06 - Questions - Chris Glasbey
21 avr. 2007 · 13 min
Chris Glasbey - Biomathematics and Statistics Scotland Bande son disponible au format mp3 Durée : 14 mn
07 - Space-time models for soil moisture dynamics - Valérie Isham
20 avr. 2007 · 48 min
Soil moisture provides the physical link between soil, climate and vegetation. It increases via the infiltration of rainfall and decreases through evapotranspiration, run-off and leakage, all these effects being dependent on the existing soil moisture level. During wet periods, soil moisture tends…
08 - Questions - Valérie Isham
19 avr. 2007 · 7 min
Valérie Isham - University College, London Bande son disponible au format mp3 Durée : 8 mn
09 - Analysis of spacetime patterns of disease risk - Sylvia Richardson
18 avr. 2007 · 56 min
The fields of geographical epidemiology and public health surveillance have benefited from combined advances in hierarchical model building and in geographical information systems. Exploring and characterising a variety of spatial patterns of diseases at a fine geographical resolution has become…
10 - Questions - Sylvia Richardson
17 avr. 2007 · 13 min
Sylvia Richardson - Imperial College, London Bande son disponible au format mp3 Durée : 13 mn
11 - Approximate Bayesian inference for latent Gaussian spatial models - Havard Rue
16 avr. 2007 · 43 min
Gaussian models are frequently used within spatial statistics and often as a latent Gaussian model is hierachical formulations. The devellopment of Markov chain Monte Carlo methods also allow for spatial analysis of non-Gaussian observations like spatial count and survial data. Although MCMC is…
12 - Questions - Havard Rue
15 avr. 2007 · 17 min
Havard Rue - Norwegian University of Science and Technology Bande son disponible au format mp3 Durée : 18 mn