{"title":"Explicit Expansions for Multivariate Diffusions","authors":"Xiangwei Wan, Nian Yang","doi":"10.2139/ssrn.3748893","DOIUrl":null,"url":null,"abstract":"In this paper, by adopting a quasi-Lamperti transform unitizing the process’ diffusion matrix at the initial time, we provide a new explicit recursive formula to compute the expansion coefficients for the pathwise Taylor expansion method of Li (2013). The quasi-Lamperti transform also allows us to recalculate the expansion coefficients for the Hermite expansion method of Wan and Yang (2020) via the pathwise Taylor expansion method, and proves the equivalence between the methods of Li (2013) and Wan and Yang (2020). Based on the established connection between the delta expansion method of Yang et al. (2019) and the Hermite expansion method of Wan and Yang (2020), we unifies the three expansion methods.","PeriodicalId":365755,"journal":{"name":"ERN: Other Econometrics: Mathematical Methods & Programming (Topic)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ERN: Other Econometrics: Mathematical Methods & Programming (Topic)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3748893","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
In this paper, by adopting a quasi-Lamperti transform unitizing the process’ diffusion matrix at the initial time, we provide a new explicit recursive formula to compute the expansion coefficients for the pathwise Taylor expansion method of Li (2013). The quasi-Lamperti transform also allows us to recalculate the expansion coefficients for the Hermite expansion method of Wan and Yang (2020) via the pathwise Taylor expansion method, and proves the equivalence between the methods of Li (2013) and Wan and Yang (2020). Based on the established connection between the delta expansion method of Yang et al. (2019) and the Hermite expansion method of Wan and Yang (2020), we unifies the three expansion methods.
本文采用拟lamperti变换对初始时刻的过程扩散矩阵进行统一,为Li(2013)的路径Taylor展开方法提供了新的显式递推公式来计算展开系数。准lamperti变换还允许我们通过路径Taylor展开方法重新计算Wan and Yang(2020)的Hermite展开方法的展开系数,并证明Li(2013)和Wan and Yang(2020)的方法之间的等价性。基于Yang et al.(2019)的delta展开法与Wan and Yang(2020)的Hermite展开法之间建立的联系,我们将三种展开方法进行了统一。