Sample Size -- Survival Outcomes

Proportional hazards case

Power

Ratio of sample sizes, control vs treated

Control event rate

Hazard ratio, treated vs control

Number equal length study periods

Type of patient entry  

Number study periods for uniform patient entry

Two-sided Type I error

Test statistic

List loss to follow-up rates for each period

List rates of crossover to treated for each period

List rates of crossover to control for each period