A Diversity index for model space selection in the estimation of benchmark and infectious doses via model averaging

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<title>Diversity index for model space selection in the estimation of benchmark and infectious doses via model averaging</title>
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<namePart>Kim, Steven B.</namePart>
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<abstract displayLabel="Summary">In chemical and microbial risk assessments, risk assessors fit dose-response models to high-dose data and extrapolate downward to risk levels in the range of 110%. Although multiple dose-response models may be able to fit the data adequately in the experimental range, the estimated effective dose (ED) corresponding to an extremely small risk can be substantially different from model to model. In this respect, model averaging (MA) provides more robustness than a single dose-response model in the point and interval estimation of an ED. In MA, accounting for both data uncertainty and model uncertainty is crucial, but addressing model uncertainty is not achieved simply by increasing the number of models in a model space. A plausible set of models for MA can be characterized by goodness of fit and diversity surrounding the truth. We propose a diversity index (DI) to balance between these two characteristics in model space selection. It addresses a collective property of a model space rather than individual performance of each model. Tuning parameters in the DI control the size of the model space for MA.</abstract>
<note type="statement of responsibility">Steven B. Kim, Ralph L. Kodell, Hojin Moon</note>
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<title>Risk analysis : an international journal</title>
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<publisher>McLean, Virginia : Society for Risk Analysis, 1987-2015</publisher>
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<identifier type="issn">0272-4332</identifier>
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<text>03/03/2014 Volumen 34 Número 3 - marzo 2014 </text>
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