Sample size and power for a logrank test and Cox proportional hazards model with multiple groups and strata, or a quantitative covariate with multiple strata.


I describe general expressions for the evaluation of sample size and power for the K group Mantel-logrank test or the Cox proportional hazards (PH) model score test. Under an exponential model, the method of Lachin and Foulkes for the 2 group case is extended to the K ⩾2 group case using the non-centrality parameter of the K - 1 df chi-square test. I also… (More)
DOI: 10.1002/sim.5839


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