Two Arm Survival

Two Arm Survival is a program to calculate either estimates accrual or power for differences in survival times between two groups. The program allows for unequal sample size allocation between the two groups. The survival time estimates also allow for multiple strata or risk groups.

For further details, view the Help Document.

User Input
Program Output

Select Parameters

Type Calculation

Type Input


Number Strata
Proportion in Standard Group
Years of Accrual
Years of Follow-up
Accrual Rate
Hazard Ratio

Stratum Proportion Hazard Rate, Std. Hazard Rate, Exp. Hazard Ratio Proportion Surviving, Std. Proportion Surviving, Std. Survival Time, Std. Proportion Surviving, Exp. Proportion Surviving, Exp. Proportion Surviving, Exp. Survival Time, Exp. Survival Time, Exp. Median Survival, Std. Median Survival, Exp.

Accrual Rate
Total Accrual