Predictive contribution beyond specified existing measures. A social-intelligence measure should be tested against relevant general-ability or personality measures rather than credited for any unadjusted correlation with social outcomes.
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Incremental validity refers to the extent to which a new assessment tool, measure, or predictor contributes additional information or predictive power over and above what is already provided by existing measures or predictors. In other words, it evaluates whether the new measure provides significant value in predicting an outcome or behavior, after accounting for other relevant factors.