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A comparative study of restricted randomization procedures for multiarm trials with equal or unequal treatment
Yevgen Ryeznik1,2, Oleksandr Sverdlov3
1Department of Mathematics, Uppsala University, Uppsala, Sweden.
Statistics in Medicine
|June 6, 2018
Summary
This study compares restricted randomization designs for multiarm clinical trials. Results aid investigators in selecting optimal randomization procedures for dose-ranging studies.
Area of Science:
- Clinical Trials Methodology
- Biostatistics
- Experimental Design
Background:
- Multiarm clinical trials, particularly phase II dose-ranging studies, frequently employ randomization.
- Existing literature lacks systematic comparisons of various competing randomization designs.
- Selecting appropriate randomization is crucial for trial integrity and efficiency.
Purpose of the Study:
- To systematically investigate and compare the statistical properties of different restricted randomization procedures for multiarm trials.
- To evaluate operating characteristics including allocation balance, randomness, and ratio variation.
- To assess statistical performance regarding type I error rate and power.
Main Methods:
- Systematic investigation of restricted randomization procedures for fixed and unequal allocation ratios.
- Evaluation of design operating characteristics: allocation balance, randomness, ratio variation.
- Assessment of statistical properties: type I error rate and power.
Main Results:
- Comprehensive comparison of statistical properties for various restricted randomization designs.
- Quantification of performance metrics across different allocation ratios and trial settings.
- Identification of strengths and weaknesses of competing randomization methods.
Conclusions:
- Provides crucial insights for clinical investigators to select appropriate randomization procedures.
- Offers a reproducible framework via an R shiny application for further simulations.
- Enhances understanding of randomization design performance in multiarm clinical trials.
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