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Open Access

Peer-reviewed

Research Article

Integrating preliminary test and Stein-type techniques to improve estimation in the time-dependent Cox model

Rohollah Ramezani,

Roles Formal analysis, Investigation, Methodology, Writing – original draft

Affiliation Department of Statistics, Faculty of Mathematical Sciences, Shahrood University of Technology, Shahrood, Iran
⨯
Mohammad Reza Rabiei ,

Roles Supervision

* E-mail: rabiei_stat@shahroodut.ac.ir

Affiliation Department of Statistics, Faculty of Mathematical Sciences, Shahrood University of Technology, Shahrood, Iran

https://orcid.org/0000-0003-4647-8002

⨯
Mohammad Arashi

Roles Conceptualization, Funding acquisition, Supervision, Writing – review & editing

Affiliation Department of Statistics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
⨯

Integrating preliminary test and Stein-type techniques to improve estimation in the time-dependent Cox model

Rohollah Ramezani,
Mohammad Reza Rabiei,
Mohammad Arashi

x

Published: June 8, 2026
https://doi.org/10.1371/journal.pone.0345123

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