(通讯员:关迪)2023年12月25日上午9点,我院特邀北卡罗来纳大学教堂山分校朱宏图教授做线上学术报告,437必赢会员中心网页版院长王纯杰教授、437必赢会员中心网页版副院长李纯净副教授以及学院部分老师、全体研究生参加了本次线上学术报告会,报告由437必赢会员中心网页版副院长杨凯副教授主持。
报告人简介:朱宏图,北卡罗来纳大学教堂山分校生物统计学、统计学、计算机科学和遗传学的终身教授。他于2018年至2020年担任滴滴出行研究员和首席统计科学家,并于2016年至2018年被授予 MD安德森癌症诊断成像教授。他是国际公认的统计学习、医学图像分析、精准医学、生物统计学、人工智能和大数据分析方面的专家。2011年以来,当选为美国统计协会和数理统计协会的Fellow。2016年,他获得了德克萨斯州癌症预防研究所颁发的研究人员奖项,并于2019年获得INFORMS Daniel H.Wagner卓越运营研究实践奖。在Nature、Science、Cell、Nature Genetics、PNAS、AOS、JASA、JRSSB等顶级期刊发表论文310余篇,在NeurIPS、AAAI、KDD、ICDM、MICCAI、IPMI等顶级会议发表会议论文50余篇。
报告题目:Causal inference and experimental design in two-sided markets
报告摘要:Many modem tech companies, such as Google, Uber, and Didi, utilize online experiments (also known as A/B testing) to evaluate new policies against existing ones. Analyzing the causal relationship between platform policies and outcomes of interest is of great importance to improve key platform metrics. This study focuses on capturing dynamic treatment effects in complex temporal/ spatial experiments and designing informative experiments. We propose a temporal/spatio-temporal varying coefficient decision process (VCDP) model to characterize dynamic treatment effects. Average treatment effects are decomposed into direct and indirect effects (DE and IE) with estimation and inference procedures developed for both. Meanwhile, we establish a framework for calculating conditional quantile treatment effects (CQTE) based on independent characteristics. Notably, we demonstrate that dynamic CQTE equals the sum of individual CQTEs across time under specific model assumptions. Additionally, we propose three optimal allocation strategies for sequential treatments in dynamic settings to minimize variance in treatment effect estimation.Estimation procedures based on off-policy evaluation (OPE) methods are developed. Theoretical properties of the proposed methods are established, including weak convergence, asymptotic power, and optimality of the proposed treatment allocation design.Extensive simulations and real data analyses support the usefulness of the proposed methods.
在报告中,朱教授从现代科技公司入手,如谷歌、优步和滴滴,对分析平台政策和感兴趣的结果之间的因果关系进行了阐述,朱教授提出了VCDP模型来描述动态的治疗效果。进而在基于OPE方法的估计程序下提出了三个动态环境下序贯治疗的最佳分配策略,此策略会有效减少治疗效果估计的方差。通过朱教授的讲解同学们了解到研究结果要根据大量的模拟和真实的数据得出,同学们纷纷表示在今后的学习生活中要脚踏实地。
报告结束后,与会老师和同学们就感兴趣的问题与朱教授进行了广泛的讨论和交流,本次学术交流会拓展了同学们的学术视野,激发了同学们的学习热情,并使老师和同学们对双边市场有了更深的理解,提供了浓厚的学术氛围。
(审核人:王丹、王纯杰)
437必赢会员中心网页版
2023年12月25日