2026-06-28T04:45:41Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/730492023-08-06T01:20:04Zcom_20.500.14352_14col_20.500.14352_15

Evaluation of surrogate endpoints using information-theoretic measure of association based on Havrda and Charvat entropy Pardo Llorente, María del Carmen Zhao, Qian Jin, Hua Lu, Ying Surrogate endpoints have been used to assess the efficacy of a treatment and can potentially reduce the duration and/or number of required patients for clinical trials. Using information theory, Alonso et al. (2007) proposed a unified framework based on Shannon entropy, a new definition of surrogacy that departed from the hypothesis testing framework. In this paper, a new family of surrogacy measures under Havrda and Charvat (H-C) entropy is derived which contains Alonso’s definition as a particular case. Furthermore, we extend our approach to a new model based on the information-theoretic measure of association for a longitudinally collected continuous surrogate endpoint for a binary clinical endpoint of a clinical trial using H-C entropy. The new model is illustrated through the analysis of data from a completed clinical trial. It demonstrates advantages of H-C entropy-based surrogacy measures in the evaluation of scheduling longitudinal biomarker visits for a phase 2 randomized controlled clinical trial for treatment of multiple sclerosis. 2023-06-22T12:41:19Z 2023-06-22T12:41:19Z 2023-06-22T12:41:19Z 2022-01-31 journal article https://hdl.handle.net/20.500.14352/73049 2227-7390 10.3390/math10030465 eng open access MDPI