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Hello all, Can anyone point me to any publications which discuss the power for testing interactions in a Cox proportional hazards model? Specifically I want to calculate the power for detecting interaction between 2 factors each having 2 levels. Many thanks, Richard Morris Diabetes Trials Unit Radcliffe Infirmary Woodstock Road Oxford OX2 6HE Tel: 01865 224438 Fax: 01865 224858 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%