Portrait of Archer Yang

Archer Yang

Associate Academic Member
archer.yang@mcgill.ca
Associate professor, McGill University, Department of Mathematics and Statistics
Research Topics
Deep Learning
Dimensionality Reduction Methods
Drug Discovery
High-Dimensional statistics
Learning on Graphs
Machine Learning in Genomics and Healthcare
Machine Learning Theory
Probabilistic Models
Website

Biography

I am an Associate Professor in the Department of Mathematics and Statistics at McGill University, with affiliations as an Associate Member of the School of Computer Science and the Quantitative Life Science program.

My research spans three interconnected themes: statistical machine learning, applications in drug discovery and computational genomics and healthcare. In statistical machine learning, I focus on developing dimensionality reduction, probabilistic models and causality-inspired methods to address complex high-dimensional data challenges. In drug discovery, my work involves developing machine learning models to accelerate drug candidate identification and enhance the understanding of drug efficacy and safety. In computational genomics and healthcare, I develop techniques to analyze genomic data, identify biomarkers, and explore the genetic basis of diseases, with the goal of improving precision medicine and predicting patient outcomes. My overarching goal is to bridge advanced data-driven methodologies with impactful applications in pharmacology, genomics and healthcare.

For prospective graduate students interested in working with me, please apply to both Mila - Quebec Artificial Intelligence Institute and the Department of Mathematics and Statistics at McGill. Alternatively, applicants may consider co-supervision opportunities with advisors from the computer science program at McGill.

Current Students

David Fleischer
PhD - McGill University
Github
Yixuan Li
PhD - McGill University
Co-supervisor :
Yue Li
Kent Lu
Master's Research - McGill University
Github
Marshall Meng
Master's Research - McGill University
Co-supervisor :
Yue Li
Weihua Shi
PhD - McGill University
Github
Chi-Kuang Yeh
Postdoctorate - McGill University
Website
Github
Google Scholar

Publications

Abstract 4142894: Multimorbidity Trajectories Across the Lifespan in Patients with Congenital Heart Disease
Chao Li
Aihua Liu
Solomon Bendayan
Liming Guo
Judith Therrien
Archer Yang
Robyn Tamblyn
Jay Brophy
Yue Li
Ariane Marelli
Background: Befitted from advances in medical care, patients with congenital heart disease (CHD) now survive to adulthood but face elevated… (see more) risks of both cardiac and non-cardiac complications. Understanding the trajectories of comorbidity development over a patient's lifespan is cornerstone to optimize care expected to improve long-term health outcomes. Research Aim: This study aims to investigate the temporal sequences and evolution of comorbidities in CHD patients across their lifespan. We hypothesize that multimorbidity trajectories in CHD patients are linked to CHD lesion severity and age at onset of specific comorbidities. Methods: Using the Quebec CHD database which comprised data in outpatient visits, hospitalization records and vital status from 1983 to 2017, we designed a longitudinal cohort study evaluating the development of 39 comorbidities coded using ICD-9/10. Temporal sequences were mapped using median age of onset. Associations between disease pairs were quantified by hazard ratios from Cox proportional hazard models adjusting for age, sex, genetic syndrome, competing risks of death, and taking into account the time-varying nature of the predictor diseases. Results: The cohort included 9,764 individuals with severe and 127,729 with non-severe CHD lesions. In severe CHD patients, most comorbidities developed between ages 25 and 40. Comorbidity progression began with childhood cardiovascular diseases, followed by systemic diseases such as diabetes, liver and kidney diseases, and advanced to heart failure and dementia in middle adulthood. In addition, mental disorders emerged in early adulthood and were associated with subsequent development of kidney diseases and dementia. Different trajectories were observed in non-severe CHD patients with 2-3 decades later disease onsets and non-differential onsets between cardiovascular and systemic complications (Figure). Conclusions: Distinct multimorbidity trajectories were observed in CHD patients by CHD lesion severity. In patients with severe CHD lesions, early systemic diseases significantly influenced subsequent complications. These findings highlight the need for well-timed surveillance guidelines and interventions to improve health outcomes.
2024-11-12
Circulation (published)
doi.org
Structured Learning in Time-dependent Cox Models
Guanbo Wang
Yi Lian
Archer Yang
Robert W. Platt
Rui Wang
Sylvie Perreault
Marc Dorais
Mireille E. Schnitzer
2024-05-28
Statistics in Medicine (published)
doi.org
arxiv.org
Machine Learning Informed Diagnosis for Congenital Heart Disease in Large Claims Data Source
Ariane Marelli
Chao Li
Aihua Liu
Hanh Nguyen
Harry Moroz
James M. Brophy
Liming Guo
David Buckeridge
Jian Tang
Archer Yang
Yue Li
2024-02-01
JACC: Advances (published)
doi.org
Privacy-preserving analysis of time-to-event data under nested case-control sampling
Lamin Juwara
Archer Yang
Ana M Velly
Paramita Saha-Chaudhuri
2023-12-13
Statistical Methods in Medical Research (published)
doi.org
Accelerating Generalized Random Forests with Fixed-Point Trees
David L. Fleischer
David A. Stephens
Archer Yang
2023-06-20
ArXiv (preprint)
doi.org
arxiv.org
A Tweedie Compound Poisson Model in Reproducing Kernel Hilbert Space
Yi Lian
Archer Yang
Boxiang Wang
Peng Shi
Robert William Platt
Abstract Tweedie models can be used to analyze nonnegative continuous data with a probability mass at zero. There have been wide application… (see more)s in natural science, healthcare research, actuarial science, and other fields. The performance of existing Tweedie models can be limited on today’s complex data problems with challenging characteristics such as nonlinear effects, high-order interactions, high-dimensionality and sparsity. In this article, we propose a kernel Tweedie model, Ktweedie, and its sparse variant, SKtweedie, that can simultaneously address the above challenges. Specifically, nonlinear effects and high-order interactions can be flexibly represented through a wide range of kernel functions, which is fully learned from the data; In addition, while the Ktweedie can handle high-dimensional data, the SKtweedie with integrated variable selection can further improve the interpretability. We perform extensive simulation studies to justify the prediction and variable selection accuracy of our method, and demonstrate the applications in ratemaking and loss-reserving in general insurance. Overall, the Ktweedie and SKtweedie outperform existing Tweedie models when there exist nonlinear effects and high-order interactions, particularly when the dimensionality is high relative to the sample size. The model is implemented in an efficient and user-friendly R package ktweedie (https://cran.r-project.org/package=ktweedie).
2022-12-13
Technometrics (published)
doi.org