Sample Size Calculation For Cox Proportional Hazards Regression

Introduction & Importance

Sample size calculation for Cox Proportional Hazards Regression is crucial for planning clinical trials and observational studies…

How to Use This Calculator

1. Select the significance level (α).
2. Enter the desired power (1 – β).
3. Enter the hazard ratio.
4. Enter the event rate.
5. Click ‘Calculate’.

Formula & Methodology

The sample size calculation is based on the formula…

Real-World Examples

Data & Statistics

Comparison of Sample Size Calculations

α	Power	Hazard Ratio	Event Rate	Sample Size
0.05	0.8	2	0.2	128

Expert Tips

• Consider using a higher power for rare events.
• Adjust the significance level based on the study’s importance.

Interactive FAQ

What is the Cox Proportional Hazards Regression model?

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CDC Sample Size Calculator

Mayo Clinic Sample Size Calculator