Abstract
Optimal exact designs are problematic to find and study because there is no unified theory for determining them and studying their properties. Each has its own challenges and when a method exists to confirm the design optimality, it is invariably applicable to the particular problem only. We propose a systematic approach to construct optimal exact designs by incorporating the Cholesky decomposition of the Fisher Information Matrix in a Mixed Integer Nonlinear Programming formulation. As examples, we apply the methodology to find D- and A-optimal exact designs for linear and nonlinear models using global or local optimizers. Our examples include design problems with constraints on the locations or the number of replicates at the optimal design points.
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Acknowledgements
The research of Wong is partially supported by a grant from the National Institute of General Medical Sciences of the National Institutes of Health under Award Number R01GM107639. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. The authors acknowledge two anonymous reviewers that contributed undoubtedly to improve the quality of the paper.
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Duarte, B.P.M., Granjo, J.F.O. & Wong, W.K. Optimal exact designs of experiments via Mixed Integer Nonlinear Programming. Stat Comput 30, 93–112 (2020). https://doi.org/10.1007/s11222-019-09867-z
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DOI: https://doi.org/10.1007/s11222-019-09867-z
Keywords
- Model-based optimal designs
- Exact designs
- Constrained designs
- Mixed Integer Nonlinear Programming
- Global Optimization