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Lifetime Data Anal. 1996;2(4):315-28.

A method for checking regression models in survival analysis based on the risk score.

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  • 1Department of Mathematics, University of Oslo.


We propose to perform model check for the Cox and Aalen regression models using martingale residual processes grouped after the risk score. Asymptotic distributions of the grouped martingale residual processes are deduced, so both formal and graphical model check can be performed. The method is validated by stochastic simulation. A data example with patients with primary biliary cirrhosis of the liver is discussed.

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