Scientific activities

Scientific activities




Seminars to come (4)

Past Workshops and Conferences (45)

Past Seminars (840)

Seminars (to come)



Thursday, September 21, 2023 – 15:30:00
Seminar
UQAM : salle PK-5115 du pavillon Président-Kennedy (201 Av. du Président-Kennedy, Montréal)

Approches de médiation basées sur la régression avec réponse binaire : contourner l’hypothèse de la réponse rare ou commune

Mariia Samoilenko, UQAM



Friday, September 22, 2023 – 15:30:00 – 16:30:00
Seminar McGill Statistics Seminar Series
Hybride : Zoom & Local Burnside Hall 1104

Detection of multiple influential observations on variable selection for high-dimensional data: new perspective with an application to neurologic signature of physical pain

Dongliang Zhang, Johns Hopkins University

Influential diagnosis is an integral part of data analysis, of which most existing methodological frameworks presume a deterministic submodel and are designed for low-dimensional data (i.e., the number of predictors p smaller than the sample size n). However, the stochastic selection of a submodel from high-dimensional data where p exceeds n has become ubiquitous. Thus, methods for identifying observations that could exert undue influence on the choice of a submodel can play an important role in this setting. To date, discussion of this topic has been limited, falling short in two domains: (1) constrained ability to detect multiple influential points, and (2) applicability only in restrictive settings. In this talk, building on a recently proposed measure, we introduce a generalized version accommodating different model selectors, the asymptotic property of which is subsequently examined for large p. The K-means clustering is incorporated into our scheme to detect multiple influential points. Simulation is then conducted to assess the performances of various diagnostic approaches. The proposed procedure further demonstrates its value in improving predictive power when analyzing thermal-stimulated pain based on fMRI data. In addition, the latest development revolving around this newly proposed measure is also presented. This work is conducted under the joint supervision of Professors Masoud Asgharian and Martin Lindquist.



Thursday, September 28, 2023 – 15:30:00
Seminar
UQAM : salle PK-5115 du pavillon Président-Kennedy (201 Av. du Président-Kennedy, Montréal)

Tests d’association basés sur les copules pour un phénotype binaire et un ensemble de variants génétiques en présence de données familiales

Roland Dossa, UQAM

De nos jours, plusieurs études d’association à l’échelle du génome (Genome-Wide Association Study, GWAS) sont proposées dans le domaine de la statistique génétique. Face au flux de données génomiques générées par les nouvelles techniques de séquençage, les tests statistiques d’association analysant un variant génétique à la fois se sont avérés non-puissants. Afin d’augmenter la puissance statistique des tests d’association génétiques, des tests qui regroupent les informations provenant de plusieurs variants dans une région génomique donnée ont été développés. Ces tests calculent une statistique de test qui résume l’association globale entre les variants génétiques et le phénotype d’intérêt (ex: le statut de la maladie). Bien que les tests basés sur la région soient plus puissants, la majorité des modèles ne sont pas adéquats en présence de données familiales et phénotype binaire.Dans ce travail, nous présentons deux principales contributions dans ce contexte. Tout d’abord, nous proposons un test d’association flexible, basé sur la région, qui modélise la distribution conjointe du trait binaire au sein de chaque famille sur la base d’un modèle logistique marginal en intégrant des copules pour modéliser la dépendance entre les membres de la même famille. Dans la deuxième contribution, nous procédons à la modélisation de la distribution conjointe du trait binaire au niveau de chaque famille sur la base d’un modèle fonctionnel marginal en utilisant toujours des copules pour capturer la dépendance intrafamiliale. Nous illustrons la performance de la méthodologie proposée à l’aide de simulations et d’une étude d’association de la schizophrénie et le trouble bipolaire dans une cohorte familiale composée de 17 familles élargies de l’est du Québec.



Friday, October 27, 2023 – 15:00:00 – 16:00:00
Seminar Statistique
Concordia University, Library Building, Room LB 921-4

Small diameter properties in Banach spaces

Dr. Sudeshna Basu, Loyola University, Maryland, USA

The geometry of Banach space is an area of research which characterizes the topological and measure theoretic concepts in Banach spaces in terms of geometric structure of the space. In this work we study three different versions of small diameter properties of the unit ball in a Banach space and its dual. The related concepts for all closed bounded convex sets of a Banach space was initiated developed and extensively studied in the context of Radon Nikodym Property and Krein Milman Property in [1]and developed subsequently. We prove that all these properties are stable under lp sum for 1 ≤ p ≤ ∞, c0 sum and Lebesgue Bochner spaces. We show that these are three space properties under certain conditions on the quotient space. We also study these properties in ideals of Banach spaces. This is based on two papers jointly written with my graduate student, Susmita Seal [2], [3]. The only prerequisite for this talk are the statements of Hahn Banach Theorem.



Workshops and Conferences
(Past)



Click on the column title
to sort the array differently

2018 Centre de recherches mathématiques
Date Title Venue Participants
2004/02/26 – 2004/02/27 Workshop on Functional Data Analysis CRM
2004/05/20 – 2004/05/22 DeMoSTAFI Conference on Dependence Modelling (SSC-SSQ-ULaval-CRM-MITACS) Château Laurier, Québec
2005/03/31 – 2005/04/02 Workshop on Bayesian Inference and Functional Brain mapping CRM
2005/05/24 – 2005/05/27 Quatrième Colloque francophone sur les sondages Québec
2005/11/04 – 2005/11/06 Workshop on Survival Analysis CRM
2006/05/01 – 2006/05/05 Capture 2006: A Scientific Meeting and a Workshop on Capture-Recapture Models Québec
2006/05/23 – 2006/05/27 NPCDS/MITACS Spring School on Statistical and Machine Learning: Topics at the Interface CRM
2007/03/12 – 2007/03/14 Mini-cours sur les modèles GARCH et à volatilité stochastique CRM
2007/06/01 – 2007/06/01 Journée de statistique Montréal-Quebec CRM
2007/10/19 – 2007/10/19 Using Statistics for the Management of Natural Resources CRM
2008/05/02 – 2008/05/02 Copula Models : Theory and Applications Université Laval
2008/10/17 – 2008/10/17 MCMC: Theory and Applications. Scientific Meeting of the CRM Statistics Laboratory Université Sherbrooke
2009/04/04 – 2009/04/04 New Investigators Meeting CRM
2010/10/06 – 2010/10/07 Colloque “Méthodologie statistique contemporaine” Université de Sherbrooke
2010/10/22 – 2010/10/22 CRM Workshop on Missing Data Approaches in the Health and Social Services UQAM
2011/01/28 – 2011/01/28 First Quebec-Ontario Workshop on Insurance Mathematics UQAM
2011/03/16 – 2011/03/16 Journée MITACS de la pratique actuarielle – Projet Finsurance CRM
2011/07/01 – 2011/07/04 Statistics 2011 Canada: 5th Canadian Conference in Applied Statistics Concordia
2013/05/27 – 2013/05/31 Montreal Spring School of Population Genomics and Genetic Epidemiology Collège Jean-de-Brébeuf
2013/12/06 4th Graduate Student Workshop on Financial Mathematics Université de Montréal
2013/12/16 – 2013/12/17 Workshop on Nonparametric Curve Smoothing CRM
2014/01/31 – 2014/01/31 Third Workshop on Insurance Mathematics Université Laval
2014/06/09 – 2014/06/09 R workshop: Debugging and package writing McGill University
2014/06/26 – 2014/06/26 R Workshop – The R will be over Christmas: Optimisation Techniques McGill University
2014/08/29 – 2014/08/29 La statistique au service de la collectivité. Hommage à Louis-Paul Rivest pour ses 60 ans Université Laval
2014/12/15 – 2014/12/18 CRM-CANSSI Workshop on New Horizons in Copula Modeling CRM
2015/05/28 – 2015/05/28 Reproducible research: An introduction to knitr McGill Unversity
2015/06/10 – 2015/06/11 Colloque de statistique et de la biostatistique Université de Sherbrooke
2016/05/27 – 2016/05/27 Rare DNA variants, Analysis of family studies CRM
2016/06/17 – 2016/06/17 Summer Meeting of the Statistics Laboratory CRM
2016/09/26 – 2016/09/27 STAHY 2016 Workshop INRS, Québec
2017/05/12 – 2017/05/12 Spring Meeting of Statlab Université Laval
2017/06/22 – 2017/06/22 Workshop on spatial point processes UQAM
2018/05/30 – 2018/06/01 Statistical Inference for complex surveys CRM
2018/07/04 – 2018/07/06 R in Montreal 2018 UQAM
2018/11/07 – 2018/11/07 Fall Meeting of Statlab 2018 CRM
2019/05/13 – 2019/05/15 R à Québec 2019 CRM
2019/05/22 – 2019/05/24 Atlantic Causal Inference Conference 2019 McGill University
2019/06/20 – 2019/06/20 Spring Meeting of Statlab 2019 Université de Sherbrooke
2019/10/04 – 2019/10/04 Fall Meeting of Statlab 2019 CRM