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Nonparametric Methods for Measuring Conditional Dependence, Multi-Sample Dissimilarity, and Testing for Symmetry
Nonparametric Methods for Measuring Conditional Dependence, Multi-Sample Dissimilarity, and Testing for Symmetry
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151114
- ISBN
- 9798382748672
- DDC
- 310
- 저자명
- Huang, Zhen.
- 서명/저자
- Nonparametric Methods for Measuring Conditional Dependence, Multi-Sample Dissimilarity, and Testing for Symmetry
- 발행사항
- [Sl] : Columbia University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 329 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
- 주기사항
- Advisor: Sen, Bodhisattva.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2024.
- 초록/해제
- 요약We describe new nonparametric methods for (i) quantifying conditional dependence, (ii) quantifying multi-sample dissimilarity, and (iii) testing multivariate symmetry. In the first part of the thesis, we propose a kernel partial correlation (KPC) to quantify conditional dependence, and a kernel measure of dissimilarity between multiple distributions (KMD) to quantify the difference between multiple distributions. These two measures are both deterministic numbers between 0 and 1, with 0 and 1 corresponding to the two extreme cases --- KPC is 0 if and only if perfect conditional dependence holds, and 1 if and only if there is a conditional functional relationship; while KMD is 0 if and only if all the distributions that are compared are equal, and 1 if and only if these distributions are mutually singular. Both KPC and KMD can be estimated consistently using a computationally efficient graph-based method (including k-nearest neighbor graph and minimum spanning tree). For applications, KPC can be used to develop a model-free variable selection algorithm. This algorithm is provably consistent under sparsity assumptions, and shows superior performance in practice compared to existing procedures. KMD can be used to design an easily implementable test for the equality of multiple distributions, which is consistent against all alternatives where at least two distributions are not equal.A problem closely related to multi-sample testing is testing for symmetry. In the second part of the thesis, we develop distribution-free tests for multivariate symmetry (that includes central symmetry, sign symmetry, spherical symmetry, etc.) based on multivariate signs, ranks and signed-ranks defined via optimal transport (OT). One test we propose can be thought of as a multivariate generalization of Wilcoxon signed-rank (GWSR) test and shares many of the appealing properties of its one-dimensional counterparts. In particular, when testing against location shift alternatives, the GWSR test suffers from no loss in (asymptotic) efficiency, when compared to Hotelling's T2 test, despite being nonparametric and exactly distribution-free. Another test we propose is based on a combination of kernel methods and the multivariate signs and ranks defined via OT. This test is universally consistent against all alternatives, while still maintaining the distribution-free property. Furthermore, it is capable of testing a broader class of multivariate symmetry, including exchangeability, extending beyond the class of symmetry testable by GWSR.
- 일반주제명
- Statistics
- 일반주제명
- Applied mathematics
- 일반주제명
- Mathematics
- 키워드
- Kernel methods
- 기타저자
- Columbia University Statistics
- 기본자료저록
- Dissertations Abstracts International. 85-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017160767
■00520250211151114
■006m o d
■007cr#unu||||||||
■020 ▼a9798382748672
■035 ▼a(MiAaPQ)AAI31144799
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a310
■1001 ▼aHuang, Zhen.
■24510▼aNonparametric Methods for Measuring Conditional Dependence, Multi-Sample Dissimilarity, and Testing for Symmetry
■260 ▼a[Sl]▼bColumbia University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a329 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-11, Section: B.
■500 ▼aAdvisor: Sen, Bodhisattva.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2024.
■520 ▼aWe describe new nonparametric methods for (i) quantifying conditional dependence, (ii) quantifying multi-sample dissimilarity, and (iii) testing multivariate symmetry. In the first part of the thesis, we propose a kernel partial correlation (KPC) to quantify conditional dependence, and a kernel measure of dissimilarity between multiple distributions (KMD) to quantify the difference between multiple distributions. These two measures are both deterministic numbers between 0 and 1, with 0 and 1 corresponding to the two extreme cases --- KPC is 0 if and only if perfect conditional dependence holds, and 1 if and only if there is a conditional functional relationship; while KMD is 0 if and only if all the distributions that are compared are equal, and 1 if and only if these distributions are mutually singular. Both KPC and KMD can be estimated consistently using a computationally efficient graph-based method (including k-nearest neighbor graph and minimum spanning tree). For applications, KPC can be used to develop a model-free variable selection algorithm. This algorithm is provably consistent under sparsity assumptions, and shows superior performance in practice compared to existing procedures. KMD can be used to design an easily implementable test for the equality of multiple distributions, which is consistent against all alternatives where at least two distributions are not equal.A problem closely related to multi-sample testing is testing for symmetry. In the second part of the thesis, we develop distribution-free tests for multivariate symmetry (that includes central symmetry, sign symmetry, spherical symmetry, etc.) based on multivariate signs, ranks and signed-ranks defined via optimal transport (OT). One test we propose can be thought of as a multivariate generalization of Wilcoxon signed-rank (GWSR) test and shares many of the appealing properties of its one-dimensional counterparts. In particular, when testing against location shift alternatives, the GWSR test suffers from no loss in (asymptotic) efficiency, when compared to Hotelling's T2 test, despite being nonparametric and exactly distribution-free. Another test we propose is based on a combination of kernel methods and the multivariate signs and ranks defined via OT. This test is universally consistent against all alternatives, while still maintaining the distribution-free property. Furthermore, it is capable of testing a broader class of multivariate symmetry, including exchangeability, extending beyond the class of symmetry testable by GWSR.
■590 ▼aSchool code: 0054.
■650 4▼aStatistics
■650 4▼aApplied mathematics
■650 4▼aMathematics
■653 ▼aKernel methods
■653 ▼aNearest neighbor methods
■653 ▼aOptimal transport
■653 ▼aKernel partial correlation
■653 ▼aNonparametric method
■690 ▼a0463
■690 ▼a0405
■690 ▼a0364
■71020▼aColumbia University▼bStatistics.
■7730 ▼tDissertations Abstracts International▼g85-11B.
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160767▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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