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Expert Measurement and Mechanical Combination
The expert can and should be used as a provider of input for a mechanical combining process since most studies show mechanical combination to be superior to clinical combination. However, even in expert measurement, the global judgment is itself a clinical combination of other judgmental components and as such it may not be as efficient as a mechanical combination of the components. The superiority of mechanically combining components as opposed to using the global judgment for predicting some external criterion is discussed. The use of components is extended to deal with multiple judges since specific judges may be differentially valid with respect to subsets of components for predicting the criterion. These ideas are illustrated by using the results of a study dealing with the prediction of survival on the basis of information contained in biopsies taken from patients having a certain type of cancer. Judgments were made by three highly trained pathologists. Implications and extensions for using expert measurement and mechanical combination are discussed.