Publications & Talks

Publications

Research

S.J.W. Willems, M. Fiocco, J.J. Meulman. Optimal scaling for logistic regression model with ordinal covariates. In progress.

Willems S.J.W. (19 maart 2020), Advances in Survival Analysis and Optimal Scaling Methods (PhD Thesis. Mathematical Institute (MI), Faculty of Science, Leiden University). Promotor(en) en Copromotor(en): Meulman J.J., Fiocco M. [link]

Willems S., Albers C. & Smeets I. (2020), Variability in the interpretation of probability phrases used in Dutch news articles — a risk for miscommunication, JCOM : Journal of Science Communication 19(02): A03. [link, pdf]

Willems, S. J. W., Fiocco, M., and Meulman, J. J. (2019) Combining optimal scaling and survival techniques to identify possible predictors for unemployment duration. International Journal of Statistics & Economics, 20(3), 1–22. [link]

Willems S.J.W., Schat A., Noorden M.S. & Fiocco M. (2018), Correcting for Dependent Censoring in Routine Outcome Monitoring Data by applying the Inverse Probability Censoring Weighted Estimator, Statistical Methods in Medical Research 27(2): 323-335. [link]

Outreach

2020: De strijd tussen de wiskundige constanten: pi versus tau [blog, shorter version] Wetenschap.nu and nu.nl
2018: Onzekerheid hoort bij onderzoek. Wantrouw onnauwkeurige resultaten daarom niet, maar gebruik ze bij je keuzes [blog] Wetenschap.nu
2018: Opzet referendum verhindert representatieve uitkomst [blog] Wetenschap.nu
2018: Tijd voor taart, het is Pi-dag! [blog] Wetenschap.nu
2017: Correlatie als oorzaak en gevolg in nieuwsberichten vaak voorbarig [blog] Wetenschap.nu

Selected talks

Conferences and seminars

2020: Variability in the interpretation of Dutch probability phrases – a risk for miscommunication [slides] CWI; LUXs seminar Universiteit Leiden
2019: Optimal scaling transformations in generalized linear models with nonlinear covariates [slides] Tilburg University
2019: Variability in the interpretation of Dutch probability phrases – a risk for miscommunication [poster] Etmaal; IOPS Winter Conference
2017: Optimal Scaling for Survival Analysis with Ordinal Data, oral presentation [slides] European Meeting of Statisticians 2017, Helsinki
2016: Optimal Scaling in Survival Analysis with Ordinal Data [poster] IBC Victoria, Canada; Population-based Time-to-event Analyses International Conference, London
2015: Optimal Scaling in Survival Analysis [poster] IOPS Winter Conference
2015: Correcting for informative censoring by applying the Inverse Probability Censoring Weighted Estimator [poster] ISCB Conference, Utrecht

Outreach

2020: Interview for article “RIVM overweegt nieuw voorbehoud: hoe betrouwbaar zijn de Corona-statistieken? [article] Scientias
2019: Variability in the interpretation of Dutch probability phrases – a risk for miscommunication [slides] Royal Netherlands Meteorological Institute (KNMI); Water Resources Research Colloquium, Technical University Delft
2019: Statistics Communication [radio] Sleutelstad FM
2018: Correlatie is geen causaliteit – Acteur die Oscars winnen leven langer dan acteurs die niet in de prijzen vallen. Een causaal verband of een denkfout? [slides] Open Day Universiteit Leiden
2015: Time to PhD Defense PhD Colloquium, Mathematical Institute, Universiteit Leiden