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.

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User Input

Program Output

Type Calculation

Sample Size

Power

Type Input

Hazard Ratio

Survival Proportions

Medians

Sided

1 Sided

2 Sided

Number Strata
1
2
3
4
5
6

Proportion in Standard Group

Alpha

Years of Accrual

Years of Follow-up

Accrual Rate

Hazard Ratio

Power

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. |
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Accrual Rate

Power

Total Accrual