En naviguant sur notre site vous acceptez l'installation et l'utilisation des cookies sur votre ordinateur. En savoir +

Menu Logo Principal AgroParisTech

MIA Paris

Marie-Pierre Etienne

Assistant Professor

UMR AgroParisTech/INRA 518
Team MORSE
16 rue Claude Bernard
75 231 Paris Cedex 05
Tel : +33 (0)1 44 08 86 82 f
ax : +33 (0)1 44 08 16 66

Research

Hierarchical modeling is a powerful framework which allows wide flexibility in model conception.
The studies related to environmental issues mostly occur in some uncontrolled design. Therefore classical statistical models are not pertinent to study the obtained data (spatial dependence, multi scales, zero inflated, large p small n ….). Furthermore, the ecological processes of interest are mostly hidden and data are just a truncated observation of those processes (tuna declared captures as an indicator of the tuna biomass, number of prey in stomach as a measure of tuna feeding, acceleration data for trajectories of fur seals …) Hierarchical modeling is a useful framework to propose adequate models to link observations and latent processes of interest. I work in collaboration with biologists and ecologists in order to develop and analyze statistical models which a strong interest in highlighting the links between biological and mathematical assumptions. Hierarchical Bayesian Model are then a powerful tool for modelling ecological process but the counterpart is the potential difficulty of estimations of such models. The limits of classical algorithms for the estimation of hidden variables models like EM, MCEM in a frequentist framework or Hastings-Metropolis, Gibbs sampler in a Bayesian framework are reached and put some limitations on the modelling process.

Current Focus on :

  • Abundance indices : Managing a fish population requires to have accurate information of the actual level of this popupaltion (Bluefin Tuna is one of the most emblematic example), how can me help Fisheries Scientist to define reliable abundance indices ?
  • Trajectories Analysis : A population is not only described by its size but also by the spatial and temporal movements. Telemetry is the measure of individual movements using various Tags. It's more and more common in ecology to study fine scale behaviour of animals, from cervids, bovine animals to fish using individuals tags. The resulting data can be very different in term of density (1 GPS position every day to one position every 15mn, measure of depth every second) but also the nature of the data highly depends of the kind of tags used. Available data can be GPS positions, 3D accelerations, 3D compas, depths, …

Some Preprints

Random effects compound Poisson model to represent data with extra zeros

Extracting abundance indices from longline surveys : method to account for hook competition and unbaited hooks

Some talks

Teaching

  • Coordinator of regular courses at AgroParistech (since 2011) on Linear Models 
  • Coordinator of regular courses in Master degree in Ecological science EBE AgroParisTech (since 2006) 
    • Introduction to Statistics,
    • Advanced Statistics for Ecological Science 
    • Random Model in ecology and environment 
  • Regular courses at AgroParisTech-ENGREF
    • Statistical Modeling for risk assessment and management
    • Simulation and Prediction using random modeling 
  • Fall 2007 : Hierarchical and Bayesian Modeling in marine science using OpenBugs, professional formation for Fisheries science center (Centre de Ressourece halieutique ,CRH, Sete)

Some useful things

Scientific animation

Member of Environmental Groupe at SFDS

Leader of the groupe Statistics for trajectories (funded by INRA, MIA research division)

Latest papers

Pierre Gloaguen,Marie-Pierre Etienne, Sylvain Le Corff . Stochastic differential equation based on a Gaussian potential field to model fishing vessels trajectories  http://arxiv.org/abs/1509.09103

Wege, Mia, Etienne, Marie-Pierre, Oosthuizen, W. Chris, Reisinger, Ryan, Bester, Marthan and de Bruyn, Nico. Trend changes in sympatric Subantarctic and Antarctic fur seal pup populations at Marion Island, Southern Ocean" to appear in Marine Mammal Science

N. C. Friggens, C. Duvaux-Ponter, M. P. Etienne, T. Mary-Huard and P. Schmidely. Characterizing individual differences in animal responses to a nutritional challenge: towards improved robustness measures to appear in Journal of Dairy Science

Ophélie SAUZET, Cécilia CAMMAS, Pierre BARBILLON, Marie-Pierre ETIENNE and David MONTAGNE Illuviation intensity and land use change: Quantification via micromorphological analysis to appear in Geoderma.

Publications de Marie-Pierre Etienne

>>>
Lire la suite