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Bayesian Predictive Posterior Distributions
Bayesian Predictive Posterior Distributions  / Fuheng Cui
Bayesian Predictive Posterior Distributions

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260311091536.5
ISBN  
9798270228941
DDC  
519.5
저자명  
Cui, Fuheng
서명/저자  
Bayesian Predictive Posterior Distributions / Fuheng Cui
발행사항  
[Sl] : The University of Texas at Austin, 2025
형태사항  
1 electronic resource (196 pages)
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisors: Walker, Stephen Grahm Committee members: Williamson, Sinead; Taillefumier, Thibaud; Linero, Antonio.
학위논문주기  
- Ph.D. : The University of Texas at Austin, 2025.
초록/해제  
요약Bayesian uncertainty can be characterized in a number of ways, the usual one starting with a prior distribution which represents prior uncertainty as to the value of a parameter. This gets updated to the posterior quantification of uncertainty via the data evidence using the likelihood function. This framework is however difficult to relax. An alternative representation of Bayesian uncertainty has been provided by Doob in 1949 who showed that a predictive sampling scheme also provided a representation of the posterior. This set-up can be relaxed by modifying the nature of a predictive density function. In short, it can be a density estimator given the current knowledge. The idea then is to impute the missing data from the observed sample onwards updating the density estimator as it goes. By modeling the unseen data through this scheme, the object of interest can be computed by the observed data and the simulated unseen data. Under some conditions, we can prove that this procedure is equivalent to sampling from a posterior. In this dissertation, several methods using the predictive sampling scheme are discussed. We first introduce some prerequisite knowledge, such as Bayesian bootstrap, Dirichlet process, discrete-time martingale and its convergence, weak convergence of random measures and exchangeability. Then making use of the advantage of convergence of martingales, the martingale posterior is discussed in the dissertation. Inspired by martingale posteriors, a Bayesian bootstrap for mixture models is introduced as an extension of the traditional Bayesian bootstrap to mixture models. Using submartingales, a new approach to quantify the uncertainty for the log-concave densities is proposed, by which we can directly sample densities from the posterior. A natural martingale posterior constructed by the score function is discussed for Bayesian parametric models as well. In theory, instead of requiring exchangeability in the traditional prior-likelihood-posterior scheme, we only need some weaker conditions such as asymptotic exchangeability in the predictive sampling scheme. In application, these methods can be implemented in parallel and avoid using Markov chain Monte Carlo methods. We prove the convergence and exchangeability for each method. We also provide illustrations and comparisons with the existing methods on both simulated and real data.
언어주기  
English
일반주제명  
Statistics
일반주제명  
Applied mathematics
일반주제명  
Biostatistics
키워드  
Bayesian uncertainty
키워드  
Predictive sampling scheme
키워드  
Martingale posterior
키워드  
Bayesian bootstrap
기타저자  
The University of Texas at Austin Statistics
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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■1001  ▼aCui,  Fuheng▼eauthor.
■24510▼aBayesian  Predictive  Posterior  Distributions  ▼cFuheng  Cui
■260    ▼a[Sl]▼bThe  University  of  Texas  at  Austin▼c2025
■264  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a1  electronic  resource  (196  pages)
■336    ▼atext▼btxt▼2rdacontent
■337    ▼acomputer▼bc▼2rdamedia
■338    ▼aonline  resource▼bcr▼2rdacarrier
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisors:  Walker,  Stephen  Grahm    Committee  members:  Williamson,  Sinead;  Taillefumier,  Thibaud;  Linero,  Antonio.
■5021  ▼bPh.D.▼cThe  University  of  Texas  at  Austin▼d2025.
■520    ▼aBayesian  uncertainty  can  be  characterized  in  a  number  of  ways,  the  usual  one  starting  with  a  prior  distribution  which  represents  prior  uncertainty  as  to  the  value  of  a  parameter.  This  gets  updated  to  the  posterior  quantification  of  uncertainty  via  the  data  evidence  using  the  likelihood  function.  This  framework  is  however  difficult  to  relax.  An  alternative  representation  of  Bayesian  uncertainty  has  been  provided  by  Doob  in  1949  who  showed  that  a  predictive  sampling  scheme  also  provided  a  representation  of  the  posterior.  This  set-up  can  be  relaxed  by  modifying  the  nature  of  a  predictive  density  function.  In  short,  it  can  be  a  density  estimator  given  the  current  knowledge.  The  idea  then  is  to  impute  the  missing  data  from  the  observed  sample  onwards  updating  the  density  estimator  as  it  goes.  By  modeling  the  unseen  data  through  this  scheme,  the  object  of  interest  can  be  computed  by  the  observed  data  and  the  simulated  unseen  data.  Under  some  conditions,  we  can  prove  that  this  procedure  is  equivalent  to  sampling  from  a  posterior.  In  this  dissertation,  several  methods  using  the  predictive  sampling  scheme  are  discussed.  We  first  introduce  some  prerequisite  knowledge,  such  as  Bayesian  bootstrap,  Dirichlet  process,  discrete-time  martingale  and  its  convergence,  weak  convergence  of  random  measures  and  exchangeability.  Then  making  use  of  the  advantage  of  convergence  of  martingales,  the  martingale  posterior  is  discussed  in  the  dissertation.  Inspired  by  martingale  posteriors,  a  Bayesian  bootstrap  for  mixture  models  is  introduced  as  an  extension  of  the  traditional  Bayesian  bootstrap  to  mixture  models.  Using  submartingales,  a  new  approach  to  quantify  the  uncertainty  for  the  log-concave  densities  is  proposed,  by  which  we  can  directly  sample  densities  from  the  posterior.  A  natural  martingale  posterior  constructed  by  the  score  function  is  discussed  for  Bayesian  parametric  models  as  well.  In  theory,  instead  of  requiring  exchangeability  in  the  traditional  prior-likelihood-posterior  scheme,  we  only  need  some  weaker  conditions  such  as  asymptotic  exchangeability  in  the  predictive  sampling  scheme.  In  application,  these  methods  can  be  implemented  in  parallel  and  avoid  using  Markov  chain  Monte  Carlo  methods.  We  prove  the  convergence  and  exchangeability  for  each  method.  We  also  provide  illustrations  and  comparisons  with  the  existing  methods  on  both  simulated  and  real  data.
■546    ▼aEnglish
■590    ▼aSchool  code:  0227
■650  4▼aStatistics
■650  4▼aApplied  mathematics
■650  4▼aBiostatistics
■653    ▼aBayesian  uncertainty
■653    ▼aPredictive  sampling  scheme
■653    ▼aMartingale  posterior
■653    ▼aBayesian  bootstrap
■7102  ▼aThe  University  of  Texas  at  Austin▼bStatistics.▼edegree  granting  institution.
■7201  ▼aWalker,  Stephen  Grahm▼edegree  supervisor.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361118▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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