Welcome on my webpage!
I am an assistant professor at Strasbourg University, France since October 1st, 2009.
To contact me, send me an email!
Email:
geffray(at)math.unistra.fr
Research interests
So far, I have been working on the following subjects:
- Estimation of lifetime distributions in the presence of censoring
- Competing risks and recurrent events
- Non-parametric inference and semi-parametric models from duration data
Sometimes, I get interested in:
- Extreme value theory
I am also currently interested in:
- Modelisation and statistical inference in the field of biomaterials for tissue engineering
- Statistical inference from image data
- Semiparametric regression problems
Publications
My Ph.Thesis is here: (it is written in english but the general introduction is in french)
- Ph.Thesis, University Paris 6, France
Non-parametric estimation from censored data in a multi-state framework
My published papers are here:
- Geffray S., Klutchnikoff N., Vimond M. (2016), Illumination problems in digital images. A statistical point of view, J. Mult. Anal., 150: 191-213
- Bouaziz O., Geffray S., Lopez O. (2015), Semiparametric inference for the recurrent events process by means of a single-index model, Statistics, 49(2): 361-385
- Geffray S. (2013), Modeling and inferential thoughts for consecutive gap times observed with death and censoring, Invited paper in the special issue of the Journal of the Iranian Statistical Society on recurrent events, 12 (1):71-112
- Geffray S., Guilloux A. (2011), Maximum likelihood estimator for cumulative incidence functions under proportionality constraint, Sankhya, series A, 73 (2): 303-328
- Beirlant J., Geffray S., Guillou A. (2011), Estimation of the bias of the maximum likelihood estimators in an extreme value context, Comm. Statist. Theory Meth., 40 (22): 3959-3971
- Geffray S. (2009), Strong approximations for dependent competing risks with independent censoring with statistical applications, TEST, 18 (1): 76-95
- Geffray S. (2007), Estimation dans un modèle de risques concurrents éventuellement dépendants en présence de censure, C. R. Acad. Sci. Paris, Ser. I, 344: 457-460
- Geffray S., Guilloux A. (2005), Estimation dans un modèle de Koziol-Green généralisé, C. R. Acad. Sci. Paris, Ser. I, 341: 49-52
Some preprints are here:
- Coiffard-Marre C., Geffray S. (2015), Object detection and automatic measurements with a data-driven algorithm for marked point process optimization, working paper
- Bouaziz O., Geffray S., Lopez O. (2010), Semiparametric inference for the recurrent event process by means of a single-index model , working paper
- Geffray S. (2007), Strong approximations for dependent competing risks with independent censorship, working paper