Nick Seewald, PhD
Nick Seewald, PhD
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Presentations, Workshops, and Posters
2025
Ecological regression in health policy evaluation: A guilt-free dessert
An invited talk in a symposium titled “Can we have our cake and eat it too? Integrating epidemiologic and econometric methods to causal inference”, organized by Ellicott Matthay.
Jun 11, 2025 10:23 AM — 10:23 AM
Boston, MA, USA
Nicholas J. Seewald
Slides
Design Thinking for Policy Evaluation: The Policy Trial Emulation Framework
An invited seminar at the North Carolina State University Department of Statistics.
Apr 4, 2025
Raleigh, NC
Nicholas J. Seewald
Project
Slides
Paper
How to Ask the Right Question: Choosing Estimands for Health Policy Research
An invited talk at the 2025 ENAR Spring Meeting, in a session titled “It’s All About the Estimand: Asking the Right Questions to Best Inform Health Policy Decisions” organized by Nandita Mitra.
Mar 24, 2025 1:45 PM — 2:10 PM
New Orleans, LA
Nicholas J. Seewald
Slides
Target Trial Emulation for Evaluating Mental Health Policy
A methods webinar in a series sponsored by the NIMH-funded Johns Hopkins ALACRITY Center for Health and Longevity in Mental Illness, aiming to highlight advanced quantitative methods and mixed methods to help answer important questions in mental health services research.
Mar 19, 2025 11:00 AM — 12:00 PM
Virtual
Nicholas J. Seewald
Target Trial Emulation for Evaluating Health Policy
An invited virtual seminar for the University of Pennsylvania Health Policy / Center for Health Initiatives and Behavioral Economics analytics group.
Jan 21, 2025 12:00 PM — 1:00 PM
Virtual
Nicholas J. Seewald
Project
Slides
Embedding Qualitative and Quantitative Methods for Policy Evaluation
A 2-hour pre-conference workshop at ICHPS 2025 on blending high-quality design, analysis, and qualitative research to produce impactful policy evaluation studies.
Jan 6, 2025 1:30 PM — 3:30 PM
San Diego, CA
Nicholas J. Seewald
,
Eli Ben-Michael
,
Beth McGinty
2024
Target Trial Emulation for Evaluating Mental Health Policy
An invited talk on the policy trial emulation framework with application to mental health at the Thomas R. Ten Have Symposium on Statistics in Mental Health.
Jun 28, 2024 2:50 PM — 3:20 PM
New York, NY
Nicholas J. Seewald
,
Beth McGinty
,
Elizabeth A. Stuart
Project
Slides
Practical Guidance on Whether and When to Aggregate Individual‐Level Data for Causal Health Policy Evaluation
Health policy researchers often have questions about the effects of state policy on individual-level outcomes collected over multiple …
May 16, 2024 3:30 PM — 3:45 PM
Seattle, WA
Nicholas J. Seewald
Project
Slides
Target Trial Emulation for Evaluating Health Policy
An invited virtual seminar as part of the Philadelphia Chapter of the American Statistical Association’s monthly webinar series.
Mar 21, 2024 11:00 AM — 12:00 PM
Virtual
Nicholas J. Seewald
Project
Slides
2023
Handling Correlation in Stacked Difference-in-Differences Estimates with Application to Medical Cannabis Policy
Health policy researchers often have questions about the effects of a policy implemented at some cluster-level unit, e.g., states, …
Dec 17, 2023 1:50 PM — 3:30 PM
Berlin, Germany
Nicholas J. Seewald
,
Beth McGinty
,
Kayla Tormohlen
,
Ian Schmid
,
Elizabeth A. Stuart
Project
Slides
Paper
Target Trials in Policy Evaluation: A Case Study in Medical Cannabis Laws
A talk at SER 2023 in an invited symposium titled “Specifying and emulating target trials to estimate causal effects of complex exposures” organized by Ellen Caniglia.
Jun 16, 2023 10:15 AM — 11:45 AM
Portland, OR, USA
Nicholas J. Seewald
,
Beth McGinty
,
Elizabeth A. Stuart
Project
Slides
Handling Correlation in Stacked Difference-in-Differences Estimates with Application to Medical Cannabis Policy
Health policy researchers often have questions about the effects of state policy on individual-level outcomes collected over multiple …
May 24, 2023 1:45 PM — 3:00 PM
Austin, TX, USA
Nicholas J. Seewald
,
Beth McGinty
,
Kayla Tormohlen
,
Elizabeth A. Stuart
Project
Slides
Ready to Roll? Practical Guidance on Whether and When to Aggregate Data in Health Policy Evaluation
A contributed presentation at JSM 2022. Part of a session on “Statistical Methods in Policy Evaluation: From COVID-19 to Medical Cannabis–Related Policy”.
Jan 10, 2023 5:15 PM — 5:30 PM
Scottsdale, AZ, USA
Nicholas J. Seewald
,
Kayla Tormohlen
,
Beth McGinty
,
Elizabeth A. Stuart
Project
Slides
2022
Using Individual-Level Data in Difference-in-Differences for Health Policy and Service Evaluation
A talk for the Research in Progress seminar series from the Johns Hopkins ALACRITY Center for Health and Longeivty in Mental Illness. I provide an overview of difference-in-differences (DiD), highlight a challenge (and solution) that arises when using individual-level data in DiD analyses, and offer guidance on when and how individual-level data is useful.
Nov 9, 2022 3:00 PM — 4:00 PM
Virtual.
Nicholas J. Seewald
Slides
Handling Correlation in Stacked Difference-in-Differences Estimates with Application to Medical Cannabis Policy
A contributed presentation at JSM 2022. Part of a session on “Statistical Methods in Policy Evaluation: From COVID-19 to Medical Cannabis–Related Policy”.
Aug 8, 2022 3:20 PM — 3:35 PM
Washington, DC, USA
Nicholas J. Seewald
,
Kayla Tormohlen
,
Beth McGinty
,
Elizabeth A. Stuart
Project
Slides
Ready to roll? Practical guidance on whether and when to aggregate data in health policy evaluation
A poster at AcademyHealth Annual Research Meeting 2022. I describe a simulation study investigating performance of difference-in-differences methods using hierarchical data for state-level health policy evaluation.
Jun 6, 2022 3:00 PM — May 18, 2022 4:00 PM
Washington, DC, USA
Nicholas J. Seewald
,
Kayla Tormohlen
,
Beth McGinty
,
Elizabeth A. Stuart
Project
Poster
Supplementary Materials
Policy evaluation in the real world: Experiences with translating cutting-edge methods for an applied audience
A talk at the 2022 American Causal Inference Conference offering advice on communicating cutting-edge methods for an applied audience, drawing on experience with using the augmented synthetic control method in a paper published in the Annals of Internal Medicine. Part of a session on methodological innovations for challenges in health policy and clinical care.
May 25, 2022 11:15 AM — 12:25 PM
Berkeley, CA, USA
Nicholas J. Seewald
,
Beth McGinty
,
Elizabeth A. Stuart
Project
Slides
An introduction to adaptive interventions and sequential multiple assignment randomized trials
A 2-hour pre-conference workshop on adaptive interventions and SMARTs geared towards behavioral health scientists at the Society of Behavioral Medicine Annual Meeting 2022.
Apr 6, 2022 1:30 PM — 3:30 PM
Baltimore, MD, USA
Ahnalee Brincks
,
Shawna N. Smith
,
Nicholas J. Seewald
Slides
A brief introduction to multi-stage trials for developing dynamic treatment regimens
A 45-minute seminar on dynamic treatment regimens (DTRs) and sequential multiple-assignment randomized trials geared towards a clinical audience.
Mar 11, 2022 9:00 AM — 10:00 AM
Virtual
Nicholas J. Seewald
Slides
Building effective adaptive interventions in mental health services research
The Johns Hopkins ALACRITY Center for Health and Longevity in Mental Illness hosts trainings for researchers interested in methods used in health services research. This series of videos provides an introduction to the use of SMARTs to build high-quality adaptive interventions for health services.
Feb 11, 2022
Nicholas J. Seewald
Video
Slides
2021
A brief introduction to multi-stage trials for developing dynamic treatment regimens
A 45-minute seminar on dynamic treatment regimens (DTRs) and sequential multiple-assignment randomized trials for a clinical audience.
Oct 22, 2021 7:30 AM — 8:30 AM
Virtual
Nicholas J. Seewald
Slides
Dissertation defense: Design and analytic considerations for sequential, multiple-assignment randomized trials with longitudinal outcomes
A dissertation defense completed in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Statistics) at the University of Michigan.
May 10, 2021 10:00 AM — 11:30 AM
Virtual
Nicholas J. Seewald
Project
Slides
Notation Cheat Sheet
longsmart
Budgeting SMART: Sample size and repeated measures with a cost constraint in a longitudinal sequential, multiple-assignment randomized trial
A contributed oral presentation at ENAR 2021.
Mar 17, 2021 3:00 PM — 3:20 PM
Virtual
Nicholas J. Seewald
,
Daniel Almirall
Project
Slides
2020
Sample size and timepoint tradeoffs for comparing dynamic treatment regimens in a longitudinal SMART
A contributed oral presentation at JSM 2020.
Aug 4, 2020 10:00 AM — 2:00 PM
Virtual
Nicholas J. Seewald
,
Daniel Almirall
Project
Slides
Video
Video Script
Design considerations for comparing dynamic treatment regimens in a longitudinal SMART
A contributed oral presentation at ENAR 2020.
Mar 23, 2020 11:30 AM — 11:45 AM
Virtual
Nicholas J. Seewald
,
Daniel Almirall
Project
Slides
2019
Sample size considerations for comparing dynamic treatment regimes in a SMART with a longitudinal outcome
An oral presentation given as part of an invited session at CMStatistics 2019 on recent advances in methods for dynamic treatment regimes.
Dec 16, 2019 4:35 PM — 5:50 PM
London, GB
Nicholas J. Seewald
,
Daniel Almirall
Project
Slides
Sample size considerations for comparing dynamic treatment regimens in a SMART with a longitudinal outcome
A contributed oral presentation at JSM 2019.
Jul 30, 2019 8:35 AM — 8:50 AM
Denver, CO, USA
Nicholas J. Seewald
,
Kelley M. Kidwell
,
James R. McKay
,
Inbal Nahum-Shani
,
Tianshuang Wu
,
Daniel Almirall
Project
Slides
Sample size considerations for comparing dynamic treatment regimens in a sequentially-randomized trial with a continuous longitudinal outcome
A contributed oral presentation at the 2019 Society for Clinical Trials Annual Meeting.
May 20, 2019 2:00 PM — 3:00 PM
New Orleans, LA, USA
Nicholas J. Seewald
,
Kelley M. Kidwell
,
Inbal Nahum-Shani
,
Tianshuang Wu
,
James R. McKay
,
Daniel Almirall
Project
Slides
Sample size considerations for comparing dynamic treatment regimens in a sequential multiple-assignment randomized trial with a continuous longitudinal outcome
A poster presented at the 2019 Michigan Student Symposium for Interdisciplinary Statistical Sciences.
Mar 29, 2019 10:00 AM — 11:15 AM
University of Michigan, Ann Arbor, MI, USA
Nicholas J. Seewald
,
Daniel Almirall
Project
Poster
2018
Sample size considerations for comparing dynamic treatment regimens in a sequential multiple-assignment randomized trial with a continuous longitudinal outcome
An oral presentation for a topic contributed session at JSM 2018 on “issues and advances in power calculations for mental health studies”.
Jul 30, 2018 9:35 AM — 9:55 AM
Vancouver, British Columbia, Canada
Nicholas J. Seewald
,
Kelley M. Kidwell
,
Inbal Nahum-Shani
,
Tianshuang Wu
,
James R. McKay
,
Daniel Almirall
Project
Slides
Sample size considerations for comparing dynamic treatment regimens in a sequential multiple-assignment randomized trial with a continuous longitudinal outcome
A poster presented during the 7th Annual Thomas R. Ten Have Symposium on Statistics in Mental Health.
Jun 7, 2018 4:20 PM — 6:20 PM
Northwestern University, Chicago, IL, USA
Nicholas J. Seewald
,
Kelley M. Kidwell
,
Inbal Nahum-Shani
,
Tianshuang Wu
,
James R. McKay
,
Daniel Almirall
Project
Poster
Sample size considerations for comparing dynamic treatment regimes in a sequential multiple-assignment randomized trial with a continuous longitudinal outcome
A contributed oral presentation at the 2018 ENAR Spring Meeting.
Mar 27, 2018 2:00 PM — 2:15 PM
Atlanta, GA, USA
Nicholas J. Seewald
,
Kelley M. Kidwell
,
James R. McKay
,
Inbal Nahum-Shani
,
Daniel Almirall
Project
Slides
2017
Sample size considerations for the analysis of continuous repeated-measures outcomes in sequential multiple-assignment randomized trials
A poster presented at the 2017 Michigan Student Symposium for Interdisciplinary Statistical Sciences. Winner, Best Departmental Poster (Statistics).
Mar 24, 2017 12:00 PM — 1:00 PM
University of Michigan, Ann Arbor, MI, USA
Nicholas J. Seewald
,
Inbal Nahum-Shani
,
James R. McKay
,
Daniel Almirall
Project
Poster
2015
Design, analysis, and sizing of sequential multiple assignment randomized trials with binary outcomes
A 45-minute invited presentation on SMARTs with binary outcomes for the U-M Department of Statistics’ Graduate Student Seminar.
Sep 24, 2015 12:00 PM — 1:00 PM
University of Michigan, Ann Arbor, MI, USA
Nicholas J. Seewald
,
Daniel Almirall
,
Kelley M. Kidwell
Slides
A SMART web-based sample size calculator
A poster at the Michigan Student Symposium for Interdisciplinary Statistical Sciences. Winner, Best Departmental Poster Award, Biostatistics.
Mar 20, 2015 10:15 AM — 11:15 AM
University of Michigan, Ann Arbor, MI, USA
Nicholas J. Seewald
,
Daniel Almirall
,
Kelley M. Kidwell
Project
Poster
2014
A SMART web-based sample size calculator
A contributed poster at the 2014 IMPACT Symposium on Multiplicity Adjustment and SMARTs.
Nov 20, 2014 5:05 PM — 6:15 PM
Cary, NC, USA
Nicholas J. Seewald
,
Daniel Almirall
,
Kelley M. Kidwell
Project
Poster
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