Sample Size Calculator for Survival Analysis using Epi Info
Introduction & Importance
Sample size calculation for survival analysis using Epi Info is a crucial step in designing epidemiological studies…
How to Use This Calculator
- Enter the significance level (α).
- Enter the power (1 – β).
- Enter the effect size (effect).
- Choose the ratio.
- Click ‘Calculate’.
Formula & Methodology
The sample size calculation is based on the following formula…
Real-World Examples
Data & Statistics
| Scenario | Sample Size (Control) | Sample Size (Case) |
|---|---|---|
| Scenario 1 | 100 | 100 |
| Scenario 2 | 150 | 75 |
Expert Tips
- Consider using a higher power for rare diseases.
- Adjust the significance level based on the number of comparisons.
Interactive FAQ
What is the default significance level?
The default significance level is 0.05.
What is power in the context of this calculator?
Power is the probability that the test will reject the null hypothesis when it is false.
Epi Info is a public domain software for epidemiologic analysis and reporting.
Sample Size Calculation for Survival Analysis – World Health Organization.