February 2010
Intermediate to advanced
552 pages
9h 47m
English
book
Common Statistical Methods for Clinical Research with SAS Examples, Third Edition, 3rd Edition
by Glenn Walker, Jack Shostak
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Chapter 21. The Log-Rank Test
21.1 Introduction 397
21.2 Synopsis 398
21.3 Examples 399
21.4 Details & Notes 408
21.1 Introduction
The log-rank test is a statistical method for comparing distributions of time until the occurrence of an event of interest among independent groups. The event is often death due to disease, but event might be any binomial outcome, such as cure, response, relapse, or failure. The elapsed time from initial treatment or observation until the event is the event time, often referred to as 'survival time', even when the event is not 'death'.
The log-rank test provides a method for comparing 'risk-adjusted' event rates. This is useful when patients in a clinical study are subject to varying degrees of opportunity to experience ...
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