Results 221 to 230 of about 209,848 (255)

Tree-Structured Proportional Hazards Regression Modeling

Biometrics, 1994
A method for fitting piecewise proportional hazards models to censored survival data is described. Stratification is performed recursively, using a combination of statistical tests and residual analysis. The bootstrap is employed to keep the probability of a Type I error (the error of discovering two or more strata when there is only one) of the method
Ahn, Hongshik, Loh, Wei-Yin
openaire   +3 more sources

Urn sampling and the proportional hazard model.

Lifetime data analysis, 1999
This paper investigates the urn sampling analogue for the score statistic relating survival to covariates assuming a proportional hazard model. The exact permutation distribution can be calculated as well as the exact low order moments for arbitrary censoring patterns. The asymptotic distribution of the score statistic is an easy consequence.
Davidov, Ori, Zelen, Marvin
openaire   +2 more sources

Proportional hazards mixed models

Advances in Methodology and Statistics, 2004
We describe our recent work on mixed effects models for right-censored data. Vaida and Xu (2000) provided a general framework for handling random effects in proportional hazards (PH) regression, in a way similar to the linear, non-linear and generalized linear mixed effects models that allow random effects of arbitrary covariates.
openaire   +2 more sources

An Extension of the Proportional-Hazards Model for Grouped Data

Biometrics, 1983
A family of transformations for probabilities is considered for the analysis of grouped survival data. Additive and multiplicative models for the hazard function are compared. A method is suggested for estimating the scale on which an additive representation of the hazard, in terms of explanatory variables, is appropriate.
openaire   +3 more sources

A hybrid repair-replacement policy in the proportional hazards model

European Journal of Operational Research, 2023
Yingzhi Zhang, Rui Zheng
exaly  

Using fractional polynomials and restricted cubic splines to model non‐proportional hazards or time‐varying covariate effects in the Cox regression model

Statistics in Medicine, 2022
Douglas Lee, Peter Austin
exaly  

A recursive method for the health assessment of systems using the proportional hazards model

Reliability Engineering and System Safety, 2022
Yingzhi Zhang, Rui Zheng
exaly  

Cox Proportional Hazards Model

Journal of Clinical Nursing, 2002
openaire   +2 more sources

Proportional hazards modelling

1991
M.J. Crowder, A.C. Kimber, R.L. Smith, T.J. Sweeting   +3 more
openaire   +1 more source

Sample-Size Calculations for the Cox Proportional Hazards Regression Model with Nonbinary Covariates

Contemporary Clinical Trials, 2000
Philip W Lavori, P W Lavori
exaly