One Arm Survival

One Arm Survival is an interactive program to calculate either estimates of accrual or power for null and alternative median survival rates assuming an exponential distribution. A cube root transformation of the hazard rate is used in the calculations to get good small sample properties. The program gives critical values for either median survival or survival probabilities from parametric exponential model.

User Input
Program Output

Select Calculation, Test type and Parameter of Interest

Sample Size
Power
1 Sided
2 Sided
Median Survival
Survival Probabilitiy

Select Study and Hypothesis Test Parameters

Accrual Time
Follow-up Time
Alpha

Null Median Survival Alt Median Survival
Null Survival Prob Alt Survival Prob At Time

Power
Sample Size
Approx Lower Critical Value
Approx Upper Critical Value