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In many predictive situations, psychologists wish to have more than one predictor. These situations occur most commonly in admissions testing for selective educational programs and for personnel decisions pertinent to hiring or promotion in industry. Such situations also occur frequently in clinical psychology, especially when prognoses are required by hospital decision makers and insurance companies wish. Such situations can be perceived as statistical or clinical. Both approaches are discussed in this entry.

Generally, the best statistical procedure for using multiple variables to make predictions is multiple regression. Multiple regression is similar to regression in bivariate (one predictor, one criterion) correlational situations. For example, researchers have studied the use of personality tests to see who can complete various experiences (e.g., going to war) without psychiatric concerns.

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