Power Calculation R Survival Analysis

Introduction & Importance

Power calculation for survival analysis is a crucial step in designing clinical trials…

How to Use This Calculator

1. Enter the significance level (α).
2. Enter the desired power (1 – β).
3. Enter the expected effect size.
4. Enter the sample size (n).
5. Click ‘Calculate’.

Formula & Methodology

The formula used in this calculator is based on the work of…

Real-World Examples

Data & Statistics

Comparison of Power Calculation Methods

Method	Power	Sample Size
Log-rank test	0.8	120
Cox proportional hazards model	0.85	105

Expert Tips

• Consider using a power analysis software for complex scenarios.
• Always round up the calculated sample size to ensure adequate power.

Interactive FAQ

What is the difference between α and β?

α is the significance level, and β is the probability of a type II error…

For more information, see the CDC’s guide on power analysis and the NIA’s resources on clinical trials.