TITLE

Segmented relationships to model erosion of regression effect in Cox regression

AUTHOR(S)
Muggeo, Vito M. R.; Attanasio, Massimo
PUB. DATE
August 2011
SOURCE
Statistical Methods in Medical Research;Aug2011, Vol. 20 Issue 4, p401
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this article we propose a parsimonious parameterisation to model the so-called erosion of the covariate effect in the Cox model, namely a covariate effect approaching to zero as the follow-up time increases. The proposed parameterisation is based on the segmented relationship where proper constraints are set to accomodate for the erosion. Relevant hypothesis testing is discussed. The approach is illustrated on two historical datasets in the survival analysis literature, and some simulation studies are presented to show how the proposed framework leads to a test for a global effect with good power as compared with alternative procedures. Finally, possible generalisations are also presented for future research.
ACCESSION #
64382760

 

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