نتایج جستجو برای: cox proportional hazards model
تعداد نتایج: 2194121 فیلتر نتایج به سال:
Asymptotic normality of corrected estimator in Cox proportional hazards model with measurement error
Most existing copula models for dependent censoring in the literature assume that parameter defining is known. However, prior knowledge on this dependence often unavailable. In article we propose a novel model under which does not need to be The based parametric relation between survival time (T) and (C), whereas marginal distributions of T C follow semiparametric Cox proportional hazards model...
BACKGROUND Polytomous logistic regression models are commonly used in case-control studies of cancer to directly compare the risks associated with an exposure variable across multiple cancer subtypes. However, the validity, accuracy, and efficiency of this approach for prospective cohort studies have not been formally evaluated. METHODS We investigated the performance of the polytomous logist...
Simulation studies present an important statistical tool to investigate the performance, properties and adequacy of statistical models in pre-specified situations. One of the most important statistical models in medical research is the proportional hazards model of Cox. In this paper, techniques to generate survival times for simulation studies regarding Cox proportional hazards models are pres...
Introduction: Colorectal cancer is one of the most widespread and killer among cancers. It is important that we predict what status people have in the future. The purpose of this study was comparison of the Cox model and Kaplan-Meier curve with IBS and also identifying the factors about predicted survival time of patients with colon cancer. Materials & Methods: This paper is related to colore...
BACKGROUND Case-cohort studies have become common in epidemiological studies of rare disease, with Cox regression models the principal method used in their analysis. However, no appropriate procedures to assess the assumption of proportional hazards of case-cohort Cox models have been proposed. METHODS We extended the correlation test based on Schoenfeld residuals, an approach used to evaluat...
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