江苏省应用数学（williamhill威廉希尔官网）中心系列学术报告
报告题目：Limiting theorem of realized covariance when zero returns are present
报告人：刘志副教授
报告时间：2023/12/19 （周二）14:30-15:30
报告地点：英国威廉希尔唯一官网A310
报告摘要：Considering the presence of bivariate price staleness, we study the problem of estimating the covariation of two semimartingales. We propose a consistent estimator and establish a unified limiting theory for the realized covariation under price staleness, which includes the existing results as special cases. Our results demonstrate that idiosyncratic price staleness can induce a bias in the realized covariation but the systematic price staleness does not affect the limit of the realized covariation. Moreover, the bias induced by price staleness makes the realized covariation closer to zero than that without the presence of price staleness, hence this explains the well-known Epps effect appropriately. We conduct Monte Carlo studies to assess the finite sample performance of the proposed theory, and some empirical applications to real high-frequency data are considered to illustrate our theory. This is a joint work with Haibin Zhu.
报告人简介：刘志, 澳门大学科技学院副教授，主要研究方向为统计学及其交叉方向。研究兴趣包括随机过程统计，金融统计，机器学习在生物信息和医学数据方面的应用。其工作的主要贡献为发展了连续时间模型的模型检验以及波动率在不同场景下的估计理论，建立了澳门本地慢性肾病病人肾小球滤过率的预测模型。论文发表于统计学及其交叉学科优秀期刊，如统计学期刊Annals of Statistics, Journal of American Statistical Association, Journal of Business and Economic Statistics, 计量经济学期刊Journal of Econometrics, Quantitative Economics, Econometric Theory, Econometrics Journal, 金融学期刊Journal of Banking and Finance, Finance and Stochastics, 生物信息学期刊Bioinformatics, 以及机器学习会议AAAI, 等. 主持完成国家自然科学基金和澳门政府基金10余项。