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Topics on Nonparametric Inference for Elliptical Distribution and Sufficient Dimension Reduction
Topics on Nonparametric Inference for Elliptical Distribution and Sufficient Dimension Red...
Topics on Nonparametric Inference for Elliptical Distribution and Sufficient Dimension Reduction

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105321
ISBN  
9798297666108
DDC  
780
저자명  
Tang, Yin.
서명/저자  
Topics on Nonparametric Inference for Elliptical Distribution and Sufficient Dimension Reduction
발행사항  
[Sl] : The Pennsylvania State University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
248 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: Li, Bing.
학위논문주기  
Thesis (Ph.D.)--The Pennsylvania State University, 2025.
초록/해제  
요약In this dissertation, we explore two directions related to nonparametric tools, with focus on nonparametric inference for elliptical distribution and nonlinear sufficient dimension reduction. In Chapters 2 and 3, we propose two nonparametric tests for elliptical distribution based on kernel embedding and KL-divergence. In Chapter 4, we propose a belted and ensembled neural network for linear and nonlinear sufficient dimension reduction.Elliptical distribution is a basic assumption underlying many multivariate statistical methods. For example, in sufficient dimension reduction and statistical graphical models, this assumption is routinely imposed to simplify the data dependence structure. Before applying such methods, we need to decide whether the data are elliptically distributed. Currently existing tests either focus exclusively on spherical distributions, or rely on bootstrap to determine the null distribution, or require specific forms of the alternative distribution. In Chapter 2, we introduce a general nonparametric test for elliptical distribution based on kernel embedding of the probability measure that embodies the two properties that characterize an elliptical distribution: namely, after centering and rescaling, (1) the direction and length of the random vector are independent, and (2) the directional vector is uniformly distributed on the unit sphere. We derive the asymptotic distributions of the test statistic via von-Mises expansion, develop the sample-level procedure to determine the rejection region, and establish the consistency and validity of the proposed test. We also develop the concentration bounds of the test statistic, allowing the dimension to grow with the sample size, and further establish the consistency in this high-dimension setting. We compare our method with several existing methods via simulation studies, and apply our test to a SENIC dataset with and without a transformation aimed to achieve ellipticity.In Chapter 3, we conduct a KL-divergence based procedure for testing elliptical distributions. The procedure simultaneously takes into account the two defining properties of an elliptically distributed random vector: independence between length and direction, and uniform distribution of the direction. The test statistic is constructed based on the k nearest neighbors (kNN) method, and two cases are considered where the mean vector and covariance matrix are known and unknown. First-order asymptotic properties of the test statistic are rigorously established by creatively utilizing sample splitting, truncation and transformation between Euclidean space and unit sphere, while avoiding assuming Frechet differentiability of any functionals. Debiasing and variance inflation are further proposed to treat the degeneration of the influence function. Numerical implementations suggest better size and power performance than the state of the art procedures.In Chapter 4, we introduce a unified, flexible, and easy-to-implement framework of sufficient dimension reduction that can accommodate both linear and nonlinear dimension reduction, and both the conditional distribution and the conditional mean as the targets of estimation. This unified framework is achieved by a specially structured neural network - the Belted and Ensembled Neural Network (BENN) - that consists of a narrow latent layer, which we call the belt, and a family of transformations of the response, which we call the ensemble. By strategically placing the belt at different layers of the neural network, we can achieve linear or nonlinear sufficient dimension reduction, and by choosing the appropriate transformation families, we can achieve dimension reduction for the conditional distribution or the conditional mean. Moreover, thanks to the advantage of the neural network, the method is very fast to compute, overcoming a computation bottleneck of the traditional sufficient dimension reduction estimators, which involves the inversion of a matrix of dimension either p or n. We develop the algorithm and convergence rate of our method, compare it with existing sufficient dimension reduction methods, and apply it to twIn Chapter 4, we introduce a unified, flexible, and easy-to-implement framework of sufficient dimension reduction that can accommodate both linear and nonlinear dimension reduction, and both the conditional distribution and the conditional mean as the targets of estimation. This unified framework is achieved by a specially structured neural network - the Belted and Ensembled Neural Network (BENN) - that consists of a narrow latent layer, which we call the belt, and a family of transformations of the response, which we call the ensemble. By strategically placing the belt at different layers of the neural network, we can achieve linear or nonlinear sufficient dimension reduction, and by choosing the appropriate transformation families, we can achieve dimension reduction for the conditional distribution or the conditional mean. Moreover, thanks to the advantage of the neural network, the method is very fast to compute, overcoming a computation bottleneck of the traditional sufficient dimension reduction estimators, which involves the inversion of a matrix of dimension either p or n. We develop the algorithm and convergence rate of our method, compare it with existing sufficient dimension reduction methods, and apply it to two data examples.o data examples.
일반주제명  
Music
일반주제명  
Coordinate transformations
일반주제명  
Chi-square test
일반주제명  
Neural networks
일반주제명  
Statistics
기타저자  
The Pennsylvania State University.
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

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■1001  ▼aTang,  Yin.
■24510▼aTopics  on  Nonparametric  Inference  for  Elliptical  Distribution  and  Sufficient  Dimension  Reduction
■260    ▼a[Sl]▼bThe  Pennsylvania  State  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a248  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Li,  Bing.
■5021  ▼aThesis  (Ph.D.)--The  Pennsylvania  State  University,  2025.
■520    ▼aIn  this  dissertation,  we  explore  two  directions  related  to  nonparametric  tools,  with  focus  on  nonparametric  inference  for  elliptical  distribution  and  nonlinear  sufficient  dimension  reduction.  In  Chapters  2  and  3,  we  propose  two  nonparametric  tests  for  elliptical  distribution  based  on  kernel  embedding  and  KL-divergence.  In  Chapter  4,  we  propose  a  belted  and  ensembled  neural  network  for  linear  and  nonlinear  sufficient  dimension  reduction.Elliptical  distribution  is  a  basic  assumption  underlying  many  multivariate  statistical  methods.  For  example,  in  sufficient  dimension  reduction  and  statistical  graphical  models,  this  assumption  is  routinely  imposed  to  simplify  the  data  dependence  structure.  Before  applying  such  methods,  we  need  to  decide  whether  the  data  are  elliptically  distributed.  Currently  existing  tests  either  focus  exclusively  on  spherical  distributions,  or  rely  on  bootstrap  to  determine  the  null  distribution,  or  require  specific  forms  of  the  alternative  distribution.  In  Chapter  2,  we  introduce  a  general  nonparametric  test  for  elliptical  distribution  based  on  kernel  embedding  of  the  probability  measure  that  embodies  the  two  properties  that  characterize  an  elliptical  distribution:  namely,  after  centering  and  rescaling,  (1)  the  direction  and  length  of  the  random  vector  are  independent,  and  (2)  the  directional  vector  is  uniformly  distributed  on  the  unit  sphere.  We  derive  the  asymptotic  distributions  of  the  test  statistic  via  von-Mises  expansion,  develop  the  sample-level  procedure  to  determine  the  rejection  region,  and  establish  the  consistency  and  validity  of  the  proposed  test.  We  also  develop  the  concentration  bounds  of  the  test  statistic,  allowing  the  dimension  to  grow  with  the  sample  size,  and  further  establish  the  consistency  in  this  high-dimension  setting.  We  compare  our  method  with  several  existing  methods  via  simulation  studies,  and  apply  our  test  to  a  SENIC  dataset  with  and  without  a  transformation  aimed  to  achieve  ellipticity.In  Chapter  3,  we  conduct  a  KL-divergence  based  procedure  for  testing  elliptical  distributions.  The  procedure  simultaneously  takes  into  account  the  two  defining  properties  of  an  elliptically  distributed  random  vector:  independence  between  length  and  direction,  and  uniform  distribution  of  the  direction.  The  test  statistic  is  constructed  based  on  the  k  nearest  neighbors  (kNN)  method,  and  two  cases  are  considered  where  the  mean  vector  and  covariance  matrix  are  known  and  unknown.  First-order  asymptotic  properties  of  the  test  statistic  are  rigorously  established  by  creatively  utilizing  sample  splitting,  truncation  and  transformation  between  Euclidean  space  and  unit  sphere,  while  avoiding  assuming  Frechet  differentiability  of  any  functionals.  Debiasing  and  variance  inflation  are  further  proposed  to  treat  the  degeneration  of  the  influence  function.  Numerical  implementations  suggest  better  size  and  power  performance  than  the  state  of  the  art  procedures.In  Chapter  4,  we  introduce  a  unified,  flexible,  and  easy-to-implement  framework  of  sufficient  dimension  reduction  that  can  accommodate  both  linear  and  nonlinear  dimension  reduction,  and  both  the  conditional  distribution  and  the  conditional  mean  as  the  targets  of  estimation.  This  unified  framework  is  achieved  by  a  specially  structured  neural  network  -  the  Belted  and  Ensembled  Neural  Network  (BENN)  -  that  consists  of  a  narrow  latent  layer,  which  we  call  the  belt,  and  a  family  of  transformations  of  the  response,  which  we  call  the  ensemble.  By  strategically  placing  the  belt  at  different  layers  of  the  neural  network,  we  can  achieve  linear  or  nonlinear  sufficient  dimension  reduction,  and  by  choosing  the  appropriate  transformation  families,  we  can  achieve  dimension  reduction  for  the  conditional  distribution  or  the  conditional  mean.  Moreover,  thanks  to  the  advantage  of  the  neural  network,  the  method  is  very  fast  to  compute,  overcoming  a  computation  bottleneck  of  the  traditional  sufficient  dimension  reduction  estimators,  which  involves  the  inversion  of  a  matrix  of  dimension  either  p  or  n.  We  develop  the  algorithm  and  convergence  rate  of  our  method,  compare  it  with  existing  sufficient  dimension  reduction  methods,  and  apply  it  to  twIn  Chapter  4,  we  introduce  a  unified,  flexible,  and  easy-to-implement  framework  of  sufficient  dimension  reduction  that  can  accommodate  both  linear  and  nonlinear  dimension  reduction,  and  both  the  conditional  distribution  and  the  conditional  mean  as  the  targets  of  estimation.  This  unified  framework  is  achieved  by  a  specially  structured  neural  network  -  the  Belted  and  Ensembled  Neural  Network  (BENN)  -  that  consists  of  a  narrow  latent  layer,  which  we  call  the  belt,  and  a  family  of  transformations  of  the  response,  which  we  call  the  ensemble.  By  strategically  placing  the  belt  at  different  layers  of  the  neural  network,  we  can  achieve  linear  or  nonlinear  sufficient  dimension  reduction,  and  by  choosing  the  appropriate  transformation  families,  we  can  achieve  dimension  reduction  for  the  conditional  distribution  or  the  conditional  mean.  Moreover,  thanks  to  the  advantage  of  the  neural  network,  the  method  is  very  fast  to  compute,  overcoming  a  computation  bottleneck  of  the  traditional  sufficient  dimension  reduction  estimators,  which  involves  the  inversion  of  a  matrix  of  dimension  either  p  or  n.  We  develop  the  algorithm  and  convergence  rate  of  our  method,  compare  it  with  existing  sufficient  dimension  reduction  methods,  and  apply  it  to  two  data  examples.o  data  examples.
■590    ▼aSchool  code:  0176.
■650  4▼aMusic
■650  4▼aCoordinate  transformations
■650  4▼aChi-square  test
■650  4▼aNeural  networks
■650  4▼aStatistics
■690    ▼a0413
■690    ▼a0800
■690    ▼a0463
■71020▼aThe  Pennsylvania  State  University.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0176
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360202▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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