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Model averaging with the hybrid model: An asymptotic study and demonstration
Kian Wee Soh1, Thomas Lumley2, Cameron Walker1
1Department of Engineering Science, 1415The University of Auckland, New Zealand.
Abstract:
In this paper, we present a new model averaging technique that can be applied in medical research. The dataset is first partitioned by the values of its categorical explanatory variables. Then for each partition, a model average is determined by minimising some form of squared errors, which could be the leave-one-out cross-validation errors. From our asymptotic optimality study and the results of simulations, we demonstrate under several high-level assumptions and modelling conditions that this model averaging procedure may outperform jackknife model averaging, which is a well-established technique. We also present an example where a cross-validation procedure does not work (that is, a zero-valued cross-validation error is obtained) when determining the weights for model averaging.
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