The logrank testBland, J Martin professor of health statisticsAltman, Douglas G professor of statistics in medicineAuthor information1 Department of Health Sciences, University of York, York YO10 5DD2 Cancer Research UK/NHS Centre for Statistics in Medicine, Institute of Health Sciences, Oxford OX3 7LFCorrespondence to: Professor Bland Competing interests: None declared.BMJ 328(7447):p 1073, May 1, 2004.Copyright ©BMJ Publishing Group Ltd.