The index of the relationship between a predictor and a criterion is known as a:

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The index of the relationship between a predictor (such as a test score, interview rating, or other measure) and a criterion (such as job performance or academic achievement) is known as a validity coefficient. This coefficient provides information about the degree to which the predictor is related to the outcome of interest. A higher validity coefficient indicates a stronger relationship between the predictor and criterion, suggesting that the predictor is a better tool for predicting performance or achievement.

The Index of the Relationship Between a Predictor and a Criterion