Events
Past Event
WED@NICO SEMINAR: Sarah Bouchat, Northwestern University "Making A Long Story Short: Eliciting Prior Information & Mapping Knowledge in Previously Published Research"
Northwestern Institute on Complex Systems (NICO)
12:00 PM
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Lower Level, Chambers Hall
Details
Speaker:
Sarah Bouchat, Assistant Professor, Department of Political Science, Northwestern University
Title:
Making A Long Story Short: Eliciting Prior Information & Mapping Knowledge in Previously Published Research
Abstract:
This paper provides a new method for mapping domains of knowledge and rigorously incorporating previous findings into current social science research using text-as-data to "elicit" prior information from previously published studies. Previous research often informs the expected direction and magnitude of effects in regression analyses, yet no research to date provides a systematic account for how and in what ways researchers can instantiate the findings of already-published work (whether qualitative or quantitative) into formal point estimates, prior distributions, or systematic summaries. The challenges of incorporating past research findings into current work apply across fields, but are particularly acute in social science settings where a significant body of research is exclusively qualitative. This paper details a text-as-data approach to extract quantified summaries from published studies, with direct applications to Bayesian modeling as well as meta-analysis.
Speaker Bio:
Sarah Bouchat is an Assistant Professor & College Fellow at Northwestern University, having completed a PhD in the Department of Political Science at the University of Wisconsin–Madison in 2017. With research interests in political methodology, comparative political economy, and authoritarian politics with a regional focus on Southeast Asia, Sarah's current work focuses on machine learning and Bayesian statistical applications, including prior elicitation, nonparametrics, and text-as-data, for the study of low information, authoritarian regimes like Myanmar.
About the Speaker Series:
Wednesdays@NICO is a vibrant weekly seminar series focusing broadly on the topics of complex systems and data science. It brings together attendees ranging from graduate students to senior faculty who span all of the schools across Northwestern, from applied math to sociology to biology and every discipline in-between.
Live Stream:
Time
Wednesday, May 9, 2018 at 12:00 PM - 1:00 PM
Location
Lower Level, Chambers Hall Map
Contact
Calendar
Northwestern Institute on Complex Systems (NICO)
WED@NICO SEMINAR: Lachlan Smith, University of Sydney "Chaos in networks of coupled oscillators with multimodal natural frequency distributions"
Northwestern Institute on Complex Systems (NICO)
12:00 PM
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Lower Level, Chambers Hall
Details
Speaker:
Lachlan Smith, Postdoctoral Fellow, School of Mathematics and Statistics. The University of Sydney
Title:
Chaos in networks of coupled oscillators with multimodal natural frequency distributions
Abstract:
Synchronization is ubiquitous to networks of coupled oscillators. We explore chaos in the Kuramoto model with multimodal distributions of the natural frequencies of oscillators and provide a comprehensive description under what conditions chaos occurs. For multimodal natural frequency distributions it is typical that there is a range of coupling strengths such that multiple synchronized clusters coexist, with one synchronized cluster per peak in the frequency distribution. We use collective coordinates to describe the inter- and intra-cluster dynamics, which reduces the Kuramoto model to a small number of effective degrees of freedom. We show that chaos of the phases of clusters can occur provided there are at least four peaks in the frequency distribution, and that chaos can occur via intermittent desynchronization of a cluster if there are three peaks. In addition, we use collective coordinates to show analytically that chaos cannot occur for bimodal frequency distributions, even if they are asymmetric and if intermittent desynchronization occurs.
Speaker Bio:
Lachlan Smith is currently a Postdoctoral Fellow at the University of Sydney in the School of Mathematics and Statistics, working with Georg Gottwald. Lachlan is interested in the collective behaviour of dynamical entities in networks, such as the synchronization of coupled oscillators. He uses a collective coordinate approach to reduce the dimension of the model, which allows greater analytical insight. Before moving to Sydney, Lachlan was a Postdoctoral Fellow at Northwestern University, working with Julio Ottino, Richard Lueptow and Paul Umbanhowar to study mixing and transport by cutting-and-shuffling, with applications to granular mixing. Lachlan received his PhD from Monash University in Mechanical Engineering.
Live Stream:
Time
Wednesday, May 29, 2019 at 12:00 PM - 1:00 PM
Location
Lower Level, Chambers Hall Map
Contact
Calendar
Northwestern Institute on Complex Systems (NICO)
WED@NICO SEMINAR: Lightning Talks with Northwestern Post Doctoral Fellows and Scholars!
Northwestern Institute on Complex Systems (NICO)
12:00 PM
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Lower Level, Chambers Hall
Time
Wednesday, June 5, 2019 at 12:00 PM - 1:00 PM
Location
Lower Level, Chambers Hall Map
Contact
Calendar
Northwestern Institute on Complex Systems (NICO)
Spring classes end
University Academic Calendar
All Day
Details
Spring classes end
Time
Saturday, June 8, 2019
Contact
Calendar
University Academic Calendar