WHY Seattle Symposium on Policy Evaluation and Causal Inference November 10-11, 2025, in Seattle WA This is a Symposium focused on methods and implementation of causal inference methods, sponsored by and Austin Nichols. The WHY Symposium is devoted to the use of causal inference methods in policy research. The Symposium features talks on methods and applied papers on a variety of topics. Sessions with presentations and discussion are mixed with opportunities for informal mingling both on site and at nearby locations in Seattle WA. See the Acknowledgements (p.19) in the Stata manual entry for hdidregress for some indication of the benefits of attending WHY symposia. Schedule Sunday 9 November, 2025: Social activities for registrants in Seattle. Monday 10 November, 2025: Sessions 9am to 4pm and lunch at Gatsby (SEA77) 428 Westlake Ave N, Seattle, WA 98109 Tuesday 11 November, 2025: Sessions 9am to 4pm and lunch at Gatsby (SEA77) 428 Westlake Ave N, Seattle, WA 98109 Detailed Schedule 1:30pm Sunday 9 Nov 102 Cherry St underground and above-ground tour of Pioneer Square, then walk to Seattle Center via Pike Place Market (and Olympic Sculpture Park, weather permitting). Sunset happy hour (with food) featuring great wines imported from California by David Card; reenactment of the Judgment of Paris 9am Mon 10 Nov Nicholas Li (GWU) Nonparametric Evidence of Nonlinear Effects Using Instrumental Variables, Part II 10am Mon 10 Nov Coady Wing (IU) Empirical Bayes Aggregation and DID 11am Mon 10 Nov Alan Griffith (UW) Network Externalities and Missing Data Noon Mon 10 Nov Catered Lunch 1pm Mon 10 Nov Jeffrey Smith (Madison) How Many Children Left Behind? A Meta-Analysis of Treatment Effect Heterogeneity in Developing-Country Education Programs 2pm Mon 10 Nov Jason Kerwin (UW) Striking the Right Balance: Why Standard Balance Tests Over-Reject the Null, and How to Fix It 3pm Mon 10 Nov Happy hour; a lot of wine not to be missed! 9am Tue 11 Nov Regina Pleninger (World Bank) Data Flows Restrictiveness and (Un)equal Productivity 10am Tue 11 Nov Leah Pomerantz (Madison) So... What Grade Are You In? The Impact of State Education Policy on Homeschooling Participation and Quality 11am Tue 11 Nov Katherine Kwok (Madison) Police Officer Interactions in Arrests, Stops, and Use of Force Noon Tue 11 Nov Catered Lunch 1pm Tue 11 Nov Hanna Han (Madison) All SROs are not created equal: Heterogeneity in school policing 5pm Tue 11 Nov Closing HH at Art Marble 21 Sign up Note there is a $100 fee for attendance; attendees must also plan their own transportation and hotel. Please sign up by October at this form. Attendance is capped at 40, and only accepted registrants may attend. There is no virtual option. Past symposia The first WHY Symposium, WHYKY in Kentucky, organized by Austin Nichols and Jose Manuel Fernandez, was co-sponsored by and the College of Business at the University of Louisville. The second WHY Symposium, organized by Austin Nichols in DC in 2022, was co-sponsored by and hosted by the National Academy of Social Insurance. The third WHY Symposium, in Park City in 2023, was organized by Adam Looney and Austin Nichols, and co-sponsored by and the University of Utah. The fourth WHY Symposium, in DC in 2024, was organized by Austin Nichols, and co-sponsored by .