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DTSTART;TZID=America/Los_Angeles:20251027T160000
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DTSTAMP:20260409T112628
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SUMMARY:Statistics Seminar: Sampling Depth Trade-Off in Function Estimation Under a Two-Level Design
DESCRIPTION:Presenter: Akira Horiguchi\, Visiting Assistant Professor\, University of California\, Davis \nDescription: Many modern statistical applications involve a two-level sampling scheme that first samples subjects from a population and then samples observations on each subject. These schemes often are designed to learn both the population-level functional structures shared by the subjects and the functional characteristics specific to individual subjects. Common wisdom suggests that learning population-level structures benefits from sampling more subjects whereas learning subject-specific structures benefits from deeper sampling within each subject. Oftentimes these two objectives compete for limited sampling resources\, which raises the question of how to optimally sample at the two levels. We quantify such sampling-depth trade-offs by establishing the L_2 minimax risk rates for learning the population-level and subject-specific structures under a hierarchical Gaussian process model framework where we consider a Bayesian and a frequentist perspective on the unknown population-level structure. These rates provide general lessons for designing two-level sampling schemes given a fixed sampling budget. Interestingly\, they show that subject-specific learning occasionally benefits more by sampling more subjects than by deeper within-subject sampling. We show that the corresponding minimax rates can be readily achieved in practice through simple adaptive estimators without assuming prior knowledge on the underlying variability at the two sampling levels. We validate our theory and illustrate the sampling trade-off in practice through both simulation experiments and two real datasets. While we carry out all the theoretical analysis in the context of Gaussian process models for analytical tractability\, the results provide insights on effective two-level sampling designs more broadly. \nBio: Akira Horiguchi is a Visiting Assistant Professor in the Department of Statistics at the University of California\, Davis. He was a Postdoctoral Associate in the Department of Statistical Science at Duke University\, advised by Professors Li Ma and Cliburn Chan. He completed his Ph.D. in Statistics at The Ohio State University\, advised by Professors Matthew T. Pratola and Thomas J. Santner. His research interests include improving nonparametric inference for flow cytometry data\, developing sensitivity analysis tools for regression trees\, and developing tree-based methods for tensor regression. \nHosted by: Professor Paul Parker
URL:https://events.ucsc.edu/event/statistics-seminar-sampling-depth-trade-off-in-function-estimation-under-a-two-level-design/
CATEGORIES:Lectures & Presentations
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DTSTART;TZID=America/Los_Angeles:20251028T110000
DTEND;TZID=America/Los_Angeles:20251028T121500
DTSTAMP:20260409T112628
CREATED:20251020T202827Z
LAST-MODIFIED:20251022T182819Z
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SUMMARY:CSE Colloquium: A Journey from Programming Systems Research to AI Agents
DESCRIPTION:Speaker: Koushik Sen\, UC Berkeley and Google DeepMind \nAbstract: Coding has emerged as an important application area for large language models (LLMs)\, with a proliferation of code-specific models and their applications across various domains and tasks such as program repair\, performance optimization\, debugging\, test generation\, documentation\, and security hardening. In this talk\, I will describe how we built powerful coding agents such as R2E-Gym and DeepSWE using test-driven methodology for solving various kinds of coding tasks\, such as repair\, optimization\, security vulnerability detection\, and refactoring.  I will also discuss a novel technique\, called GEPA\, for domain-specific optimization of AI agent systems\, which has shown a significant advantage over reinforcement learning. \nBio: Koushik Sen is a professor in the Department of Electrical Engineering and Computer Sciences at the University of California\, Berkeley. His research interest lies in Software Engineering\, Programming Languages\, and AI. He is interested in developing software tools and methodologies that improve programmer productivity and software quality. He is known for his work on “DART: Directed Automated Random Testing\,” concolic testing\, and LiveCodeBench. He has received a NSF CAREER Award in 2008\, a Haifa Verification Conference (HVC) Award in 2009\, a IFIP TC2 Manfred Paul Award for Excellence in Software: Theory and Practice in 2010\, a Sloan Foundation Fellowship in 2011\, a Professor R. Narasimhan Lecture Award in 2014\, an Okawa Foundation Research Grant in 2015\, and an ACM SIGSOFT Impact Paper Award in 2019. He has won several ACM SIGSOFT Distinguished Paper Awards. He received the C.L. and Jane W-S. Liu Award in 2004\, the C. W. Gear Outstanding Graduate Award in 2005\, and the David J. Kuck Outstanding Ph.D. Thesis Award in 2007\, and a Distinguished Alumni Educator Award in 2014 from the UIUC Department of Computer Science. He holds a B.Tech from the Indian Institute of Technology\, Kanpur\, and an M.S. and Ph.D. in CS from the University of Illinois at Urbana-Champaign. \n\nHosted by: Professor Mohsen Lesani \nLocation: Engineering 2\, E2-180 (Refreshments such as coffee and pastries will be provided.) \nZoom: https://ucsc.zoom.us/j/93445911992?pwd=YkJ2TQtF79h0PcNXbEcpZLbpK0coiY.1&jst=3
URL:https://events.ucsc.edu/event/cse-colloquium-a-journey-from-programming-systems-research-to-ai-agents/
LOCATION:Engineering 2\, Engineering 2 1156 High Street\, Santa Cruz\, CA\, 95064
CATEGORIES:Lectures & Presentations
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DTSTART;TZID=America/Los_Angeles:20251028T134000
DTEND;TZID=America/Los_Angeles:20251028T150000
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SUMMARY:Macroeconomics & International Finance Seminar Series Presents: Zhiguo He
DESCRIPTION:Macroeconomics and International Finance Seminar\nDate: Tuesday\, October 28\, 2025\nTime: 1:40-3:00 p.m.\nLocation: E2-499\n\n \n\nSpeaker: Zhiguo He\nTitle: James Irvin Miller Professor of Finance\nAffiliation: Stanford University \nHost: Michael Leung \n \nSeminar title: Household Migration and Collateral Constraint: Cash-based Housing Resettlement in China\n \nABSTRACT:   Collateral constraints reduce household migration to expensive locations by restricting financing for home purchases. This endogenous location choice can amplify the impact of relaxing borrowing constraints. Using China’s cash-based shantytown renovation program (2015-2018) as a natural experiment\, we provide evidence that cash resettlement– by converting illiquid shanty houses into cash– facilitated household location upgrading and raised house prices in more expensive locations. A dynamic spatial model with collateral constraints confirms that endogenous location upgrading amplified the effect of cash transfer\, raising lifetime housing expenditures by nearly 50%\, and house price growth in low-tier cities by 9% in 2016-2020.
URL:https://events.ucsc.edu/event/macroeconomics-international-finance-seminar-series-presents-zhiguo-he/
LOCATION:Engineering 2\, Engineering 2 1156 High Street\, Santa Cruz\, CA\, 95064
CATEGORIES:Seminars
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DTSTART;TZID=America/Los_Angeles:20251028T190000
DTEND;TZID=America/Los_Angeles:20251028T210000
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SUMMARY:Emeriti Faculty Lecture\, Fall 2025
DESCRIPTION:Kicking the Prow: Reflections on a Life in Conversation with Past and Present People and Other Creatures\nIn this lecture\, Distinguished Research Professor Diane Gifford-Gonzalez reflects on fifty-five years of zooarchaeology work\, studying animal remains from archaeological sites to explore how past people and their kin interacted. While varying in geographical and theoretical foci\, a common thread runs through what she believes are her most influential contributions to archaeology. Starting with a true story\, Professor Gifford-Gonzalez will outline how these have “kicked the prow” of wider conversations in archaeology and share a few of her creative works. \nRegister to attend in-person or virtual\nDoors open at 6:30 p.m. for guests attending in-person \nLecture: 7 p.m. \nFollowed by a reception for in-person guests \nFree and open to the public \n  \nPresented by the UC Santa Cruz Emeriti Association
URL:https://events.ucsc.edu/event/emeriti-faculty-lecture-fall-2025/
LOCATION:Music Center Recital Hall\, 400 McHenry Road\, Santa Cruz\, CA\, 95064
CATEGORIES:Lectures & Presentations
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DTSTART;TZID=America/Los_Angeles:20251030T110000
DTEND;TZID=America/Los_Angeles:20251030T130000
DTSTAMP:20260409T112628
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SUMMARY:Bridging Practices: Deepening Collaboration in Community-engaged Research and IRB Process
DESCRIPTION:Building on last April’s Bridging Perspectives: Navigating Community-Engaged Research and IRB Requirements\, this Building Practices colloquium event continues the conversation between researchers\, administrators\, and the IRB with a focus on answering the pressing questions raised by our community. Together\, we will explore: \n\nInvolving undergraduates in community-engaged research\nNavigating IRB requirements in ways that respect cultural\, social\, and political environments\nMinimizing harm and risk when conducting research with vulnerable populations and community organizations\nEthical quandaries in community-engaged research that the IRB does not cover\n\nThrough dialogue and collective problem-solving\, this session seeks to move beyond identifying barriers toward developing clearer practices\, stronger collaborations\, and more practical strategies between researchers and the IRB for supporting ethical community-engaged research. \nRoundtable Moderators \n\nRegina Day Langhout\, Professor of Psychology\nSana Khoury-Shakour\, Director of the Office of Research Compliance Administration\nJessica Taft\, Professor of LALS and Director of the Dolores Huerta Research Center for the Americas\nLora Bartlett\, Associate Professor of Education and Department Chair\nSaskias Casanova\, Associate Professor of Psychology\nMargarita Azmitia\, Distinguished Professor of Psychology and IRB Chair\nHeather Bullock\, Director of the Center for Economic Justice and Action and Professor of Psychology\nNed LeBlond\, Managing Director for the Institute of Social Transformation and Campus + Community\nRebecca London\, Professor of Sociology and Faculty Director of Campus + Community\n\nRSVP\n  \nThis is a B.Y.O. lunch time colloquium event. Event sponsors will provide drinks and snacks. \nFor more information\, please visit the event website. \nSponsors: Campus + Community and the Office of Research
URL:https://events.ucsc.edu/event/bridging-practices/
LOCATION:Namaste Lounge\, 615 College Nine Road\, Santa Cruz\, CA\, 95064
CATEGORIES:Lectures & Presentations
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DTSTART;TZID=America/Los_Angeles:20251030T134000
DTEND;TZID=America/Los_Angeles:20251030T150000
DTSTAMP:20260409T112628
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SUMMARY:Applied Microeconomics and Trade Seminar Series presents: Shanjun Li
DESCRIPTION:Applied Microeconomics and Trade Seminar\nDate: Thursday\, October 30th\, 2025\nTime: 1:40-3:00 p.m.\nLocation: E2-499\n\n \n\nSpeaker: Shanjun Li\nPersonal Webpage \nTitle: Steven and Roberta Denning Professor of Global Sustainability \nAffiliation: Stanford University \nHost: Peter Christensen \n \nSeminar title: Range Anxiety\n \nABSTRACT:   Range anxiety\, the fear of depleting battery before reaching a charging station\, is often cited as a major barrier to electric vehicle (EV) adoption\, yet there has been limited formal economic analysis to quantify its importance and understand the policy implications. We develop a continuous-time dynamic model of EV usage and charging decisions to quantify range anxiety as the utility loss from feasible yet unrealized trips due to perceived range constraints. Using high-frequency data of 188\,000 EV trips and 30\,000 charging events among 8\,000 EVs in Shanghai\, we recover model parameters governing consumer driving and charging decisions. The estimates imply that\, across EV models with varying driving ranges\, average range anxiety was about $1\,900 in 2021 but declined to $1\,200 in 2024\, driven by improvements in charging infrastructure and\, especially\, in creases in driving range. Policy simulations underscore the importance of coordinating investments in battery capacity and charging infrastructure to address range anxiety: relative to socially optimal levels\, Shanghai’s EV market has under-invested in driving range while over-investing in charging infrastructure.
URL:https://events.ucsc.edu/event/applied-microeconomics-and-trade-seminar-series-presents-shanjun-li/
LOCATION:Engineering 2\, Engineering 2 1156 High Street\, Santa Cruz\, CA\, 95064
CATEGORIES:Seminars
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