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.

User Input
Program Output

Select Parameters

Type calculation
Sample Size
Power
Type input
Hazard Rates
Survival Proportion
Sided
1 Sided
2 Sided

Number strata
Proportion in standard group
Alpha

Years of accrual
Years of follow-up
Accrual rate
Hazard ratio
Total accrual
Power


Stratum Proportion Hazard rate, std. Hazard rate, exp. Proportion surviving Survival time
1
2
3
4
5
6