Interim design analysis using Bayes factor forecasts

Area of Science:

• Statistical Methodology
• Experimental Design
• Bayesian Inference

Background:

• Effective sample size planning is crucial for study validity but challenging with limited prior data.
• Inaccurate a priori assumptions due to sparse information can lead to inefficient resource use and inconclusive findings.
• Existing experimental design methods often inadequately address the issue of sparse a priori information.

Purpose of the Study:

• To propose a novel Bayesian Monte Carlo methodology for interim design analyses.
• To enable researchers to analyze and adapt sampling plans dynamically during a study.
• To address the challenges of sample size planning with sparse a priori information.

Main Methods:

• A Bayesian Monte Carlo methodology for interim design analyses is presented.
• The approach utilizes the best available knowledge about parameters for projections.
• It allows for real-time analysis and adaptation of sampling plans.

Main Results:

• The methodology facilitates dynamic adjustment of sample size planning.
• Simulated examples demonstrate integration into common experimental designs.
• The approach provides expected evidence trajectories based on current data.

Conclusions:

• The proposed method offers an efficient, informative, and flexible solution for sample size planning.
• It effectively tackles the problem of sparse a priori information in research design.
• Interim design analyses enhance the adaptability and robustness of research studies.