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Interim Analysis of Operational Futility in Randomized Trials with Time-to-Event Endpoints and Fixed Follow-Up

Semiparametric Efficient Estimation for a Two-Sample Treatment Effect

Power Calculations for Assessing Correlates of Risk in Clinical Efficacy Trials

Simulation and Group Sequential Monitoring of Randomized Two-Stage Treatment Efficacy Trials with Time-to-Event Endpoints

Flexible and Efficient Evaluation of Principal Surrogates/Treatment Effect Modifiers

Sieve Analysis Methods for Proportional Hazards Models