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Statistical Methods for Recurrent Events and First Non-Fatal Events in Clinical Trials
Statistical Methods for Recurrent Events and First Non-Fatal Events in Clinical Trials
Statistical Methods for Recurrent Events and First Non-Fatal Events in Clinical Trials

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자료유형  
 학위논문 서양
최종처리일시  
20260202103024
ISBN  
9798315701705
DDC  
574
저자명  
Sun, Jiren.
서명/저자  
Statistical Methods for Recurrent Events and First Non-Fatal Events in Clinical Trials
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
177 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Advisor: Mao, Lu;Cook, Thomas D.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약This dissertation addresses four statistical questions related to the analysis of first non-fatal events and recurrent events-non-fatal events that occur repeatedly within the same subject-in clinical trials, and develops four corresponding statistical methods.In the first project, we investigate the question: How can we quantify the difference between the commonly reported cause-specific hazard ratio (CSHR) and the direct effect of treatment on the underlying first non-fatal event process in the presence of death? To answer this, we introduce the Proportional Principal Stratum Hazards (PPSH) model within the principal stratification framework. The PPSH model estimates the principal stratum hazard ratio (PSHR), which reflects the direct effect on the underlying first non-fatal event process, assuming correct model specification. By reporting the PSHR alongside the CSHR, researchers can gain a more comprehensive understanding of the direct effect on the underlying first non-fatal event process.In the second project, we address the question: How can we improve the precision of area under the curve estimation for the mean cumulative function while preserving its unconditional interpretability? To this end, we propose a nonparametric covariate adjustment approach that ensures efficiency gains over unadjusted analyses and applies universally to various randomization schemes, including both simple and covariate-adaptive designs.In the third project, we explore the question: How can we estimate treatment effects under a hypothetical scenario where the intercurrent event-post-randomization events affecting outcome interpretation or existence-does not occur? We apply inverse probability weighting to the widely used Lin-Wei-Yang-Ying and negative binomial models, appropriately adjusting for baseline and internal time-varying covariates, to obtain unbiased estimates of hypothetical treatment effects. Simulation studies demonstrate that our approach outperforms alternative analytical methods in terms of bias and power.In the final project, we examine the question: How can we estimate treatment effects on recurrent events and recover the underlying trajectory of recurrent events in the presence of death? We propose a parametric shared frailty model that enables formal testing of recurrent event trends and offers greater power than traditional time-to-first-event analyses in heterogeneous clinical trial populations.
일반주제명  
Biostatistics
일반주제명  
Statistics
일반주제명  
Mathematics
일반주제명  
Applied mathematics
키워드  
Causal inference
키워드  
Clinical trials
키워드  
Competing risks
키워드  
Intercurrent events
키워드  
Recurrent events
키워드  
Shared frailty model
기타저자  
The University of Wisconsin - Madison Biomedical Data Science
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aSun,  Jiren.
■24510▼aStatistical  Methods  for  Recurrent  Events  and  First  Non-Fatal  Events  in  Clinical  Trials
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a177  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
■500    ▼aAdvisor:  Mao,  Lu;Cook,  Thomas  D.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aThis  dissertation  addresses  four  statistical  questions  related  to  the  analysis  of  first  non-fatal  events  and  recurrent  events-non-fatal  events  that  occur  repeatedly  within  the  same  subject-in  clinical  trials,  and  develops  four  corresponding  statistical  methods.In  the  first  project,  we  investigate  the  question:  How  can  we  quantify  the  difference  between  the  commonly  reported  cause-specific  hazard  ratio  (CSHR)  and  the  direct  effect  of  treatment  on  the  underlying  first  non-fatal  event  process  in  the  presence  of  death?  To  answer  this,  we  introduce  the  Proportional  Principal  Stratum  Hazards  (PPSH)  model  within  the  principal  stratification  framework.  The  PPSH  model  estimates  the  principal  stratum  hazard  ratio  (PSHR),  which  reflects  the  direct  effect  on  the  underlying  first  non-fatal  event  process,  assuming  correct  model  specification.  By  reporting  the  PSHR  alongside  the  CSHR,  researchers  can  gain  a  more  comprehensive  understanding  of  the  direct  effect  on  the  underlying  first  non-fatal  event  process.In  the  second  project,  we  address  the  question:  How  can  we  improve  the  precision  of  area  under  the  curve  estimation  for  the  mean  cumulative  function  while  preserving  its  unconditional  interpretability?  To  this  end,  we  propose  a  nonparametric  covariate  adjustment  approach  that  ensures  efficiency  gains  over  unadjusted  analyses  and  applies  universally  to  various  randomization  schemes,  including  both  simple  and  covariate-adaptive  designs.In  the  third  project,  we  explore  the  question:  How  can  we  estimate  treatment  effects  under  a  hypothetical  scenario  where  the  intercurrent  event-post-randomization  events  affecting  outcome  interpretation  or  existence-does  not  occur?  We  apply  inverse  probability  weighting  to  the  widely  used  Lin-Wei-Yang-Ying  and  negative  binomial  models,  appropriately  adjusting  for  baseline  and  internal  time-varying  covariates,  to  obtain  unbiased  estimates  of  hypothetical  treatment  effects.  Simulation  studies  demonstrate  that  our  approach  outperforms  alternative  analytical  methods  in  terms  of  bias  and  power.In  the  final  project,  we  examine  the  question:  How  can  we  estimate  treatment  effects  on  recurrent  events  and  recover  the  underlying  trajectory  of  recurrent  events  in  the  presence  of  death?  We  propose  a  parametric  shared  frailty  model  that  enables  formal  testing  of  recurrent  event  trends  and  offers  greater  power  than  traditional  time-to-first-event  analyses  in  heterogeneous  clinical  trial  populations.
■590    ▼aSchool  code:  0262.
■650  4▼aBiostatistics
■650  4▼aStatistics
■650  4▼aMathematics
■650  4▼aApplied  mathematics
■653    ▼aCausal  inference
■653    ▼aClinical  trials
■653    ▼aCompeting  risks
■653    ▼aIntercurrent  events
■653    ▼aRecurrent  events
■653    ▼aShared  frailty  model
■690    ▼a0308
■690    ▼a0463
■690    ▼a0405
■690    ▼a0364
■71020▼aThe  University  of  Wisconsin  -  Madison▼bBiomedical  Data  Science.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356726▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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