Dr Gary Chan, Senior Research Fellow, National Centre for Youth Substance Use Research, UQ


Randomized controlled trial is the gold standard for causal inference yet it is not always feasible. Multi-wave longitudinal data is increasingly used for causal inference. Standard methods such as regression yield biased results in the presence of time-varying confounders. In this seminar, I will demonstrate using Inverse probability treatment weight (IPTW) and marginal structural model (MSM) to adjust for time-varying confounders. Examples in this seminar will be based on research in psychology, public health and epidemiology, and the analyses will be conducted in R and StatsNotebook.


Dr. Gary Chan is a statistician and epidemiologist at the National Centre for Youth Substance Use Research, University of Queensland. His research focuses on statistical software development, causal inferences, and the epidemiology of substance use among young people. He has served as a consultant at the United Nations Office on Drugs and Crime to evaluate the data collection methodology on global substance use data, and as a biostatistical consultant for the West Moreton Health Service.

About Seminar Series

The School of Pharmacy Seminar Series involves regular formal presentations of high-quality scholarly work with broad appeal.

The wider School community is invited to attend, including academic and professional staff, special guests, visitors, as well as HDR, postgraduate, masters and honours students.

Seminars are held on Fridays from 12pm–1pm in room 5034 in the Pharmacy Australia Centre of Excellence, 20 Cornwall St Woolloongabba (next to TRI and the PA Hospital).

Confirmed 2022 seminars



12-1pm, Friday 1st April (PACE R5034 and Zoom)

Dr Ran Wang, Mater Research Institute, UQ

12-1pm, Friday 22nd April (Zoom Only)

Dr Joanna Harnett, School of Pharmacy, The University of Sydney

12-1pm, Friday 29th April (PACE R5034 and Zoom)Dr Iman Azimi, Lecturer in Pharmaceutical Science, University of Tasmania

12-1pm, Friday 6th May (PACE R5034 and Zoom)

Dr Larisa Labzin, Institute of Molecular Bioscience, UQ

12-1pm, Friday 20th May (PACE R5034 and Zoom)

Prof Nina Barnett, Consultant Pharmacist,

Visiting Professor Kingston University, UK, London

11am-12pm, Friday 27th May (Zoom only)

Prof Terry Hebert, Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada

12-1pm, Friday 3rd June (PACE R5034 and Zoom)

A/Prof Joy Wolfram, School of Chemical Engineering, UQ

12-1pm, Friday 17th June (PACE R5034 and Zoom)

Dr Rink-Jan Lohman, School of Pharmacy, UQ and

Dr Karnaker Reddy Tupally, School of Pharmacy, UQ

12-1pm, Friday 1st July (PACE R5034 and Zoom)

Dr Khay Fong, School of Environmental Life Sciences, University of Newcastle


Online via Zoom (Register via link)