Group Sequential Methods
When to Use This Skill
- Designing group sequential trials with interim analyses
- Implementing alpha spending functions
- Setting futility stopping rules
- Calculating information fractions
- Using sim_gs_n() for GS simulations
- Integrating with gsDesign2 package
Fundamental Concepts
Group Sequential Design
A group sequential design allows for:
- Early stopping for efficacy: If treatment effect is larger than expected
- **Early stopping for futilit
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