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    Cox proportional hazard analysis with non-uniform samples; power analysis

    We have a study involving 10000 patients, 5000 of them treated with drug A and 5000 with drug B. We want to know if drug A is more effective than B. The median time to event (death) after treatment with drug A is 1000 days and for drug B it is 2000 days. There are two sampling scenario: In...