Results 211 to 220 of about 181,011 (259)

Optimal partitioning for the proportional hazards model

Journal of Applied Statistics, 2020
This paper discusses methods for clustering a continuous covariate in a survival analysis model. The advantages of using a categorical covariate defined from discretizing a continuous covariate (via clustering) is (i) enhanced interpretability of the covariate's impact on survival and (ii) relaxing model assumptions that are usually required for ...
Usha, Govindarajulu, Thaddeus, Tarpey
openaire   +2 more sources

Regression Dilution in the Proportional Hazards Model

Biometrics, 1993
The problem of regression dilution arising from covariate measurement error is investigated for survival data using the proportional hazards model. The naive approach to parameter estimation is considered whereby observed covariate values are used, inappropriately, in the usual analysis instead of the underlying covariate values. A relationship between
openaire   +3 more sources

Mixtures of proportional hazards regression models

Statistics in Medicine, 1999
This paper presents a mixture model which combines features of the usual Cox proportional hazards model with those of a class of models, known as mixtures-of-experts. The resulting model is more flexible than the usual Cox model in the sense that the log hazard ratio is allowed to vary non-linearly as a function of the covariates.
O, Rosen, M, Tanner
openaire   +2 more sources

Proportional hazards models

2011
This chapter discusses the most widely used regression models in competing risks. Following an introduction in Section 5.1, Section 5.2 discusses proportional cause-specific hazards models, and Section 5.3 discusses the proportional subdistribution hazards model. The cause-specific hazards are as defined in Chapter 3.
Jan Beyersmann, Martin Schumacher, Arthur Allignol   +2 more
openaire   +1 more source

Multivariate Generalizations of the Proportional Hazards Model

Journal of the Royal Statistical Society. Series A (General), 1985
Die Motivation für die vorliegende Arbeit stammt aus Fragestellungen der Medizin, insbes. aus klinischen Versuchen und epidemiologischen Studien in der Erforschung von Krebs- und Kreislauferkrankungen. So werden zum Beispiel herzkranke Vater-Sohn-Paare herausgegriffen und das Alter beim Tode bzw.
Clayton, David, Cuzick, Jack
openaire   +1 more source

Model misspecification in proportional hazards regression

Biometrika, 1995
Summary: The proportional hazards model is frequently used to evaluate the effect of treatment on failure time events in randomised clinical trials. Concomitant variables are usually available and may be considered for use in the primary analyses under the assumption that incorporating them may reduce bias or improve efficiency.
Anderson, Garnet L., Fleming, Thomas R.
openaire   +2 more sources

Sequential analysis of the proportional hazards model

Biometrika, 1983
Abstract : For the proportional hazards model of survival analysis, an appropriate large sample theory is developed for cases of staggered entry and sequential analysis. The principal techniques involve an approximation of the score process by a suitable martingale and a random rescaling of time based on the observed Fisher information.
Sellke, T., Siegmund, D.
openaire   +1 more source

Visualizing covariates in proportional hazards model

Statistics in Medicine, 2009
AbstractWe present a graphical method called the rank‐hazard plot that visualizes the relative importance of covariates in a proportional hazards model. The key idea is to rank the covariate values and plot the relative hazard as a function of ranks scaled to interval [0, 1].
Juha, Karvanen, Frank E, Harrell
openaire   +2 more sources

Proportional hazards model with random effects

Statistics in Medicine, 2000
We propose a general proportional hazards model with random effects for handling clustered survival data. This generalizes the usual frailty model by allowing a multivariate random effect with arbitrary design matrix in the log relative risk, in a way similar to the modelling of random effects in linear, generalized linear and non-linear mixed models ...
F, Vaida, R, Xu
openaire   +2 more sources

Frailty models that yield proportional hazards

Statistics & Probability Letters, 2002
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Aalen, Odd O., Hjort, Nils Lid
openaire   +2 more sources