PSYCH339 Lecture Notes - Lecture 10: Coefficient Of Determination, Psycinfo, Personnel Selection
10 Aug 2016
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Cross validation: degree to which derived from one sample are useful for predicting performance in another sample. We can use a technique called multiple regressions to figure out the best way to combine those two predictors. Essentially we want to add the tests together. Predicted performance = test 1+ test 2. Predicted grade school = gpa + gre. Regression tells us how much to weight to give each test. Predicted performance = 17. 54 + test 1 * 0. 85 + test 2 * 1. 04. Predicted performance is also called composite score. This decrease n validity is called shrinkage. Predicted = test 1 + test 2. Also called validity generalization in context of selection. Average of many validity studies: weighted by sample size, often other corrections (ex: unrealiability) When you find papers, have o decide whether to include. Choose tests based on validity for components, not whole job. Can even figure out overall validity by weighing importance of components.
