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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, an...
Nonparametric Methods for Measuring Conditional Dependence, Multi-Sample Dissimilarity, and Testing for Symmetry

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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
키워드  
Nearest neighbor methods
키워드  
Optimal transport
키워드  
Kernel partial correlation
키워드  
Nonparametric method
기타저자  
Columbia University Statistics
기본자료저록  
Dissertations Abstracts International. 85-11B.
전자적 위치 및 접속  
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■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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