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The incremental validity of psychological testing and assessment: conceptual, methodological, and statistical issues
John Hunsley1, Gregory J Meyer
1School of Psychology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5. hunch@uottawa.ca
Psychological Assessment
|December 25, 2003
Summary
This study addresses the lack of incremental validity research in applied psychology. It examines research designs and statistical issues to improve the evaluation of new psychological measures and clinical inferences.
Area of Science:
- Applied Psychology
- Psychometrics
Background:
- Incremental validity research is crucial for evaluating psychological measures and inferences.
- Current efforts in applied psychology often fall short in assessing incremental validity.
Purpose of the Study:
- To advance incremental validity research by examining suitable research designs.
- To address statistical and measurement challenges impacting incremental validity findings.
Main Methods:
- Review of research designs for assessing incremental validity of test instruments, clinical inferences, and new measures.
- Analysis of statistical issues: predictor entry order, interpreting validity increments, and artifactual effects.
Main Results:
- Identified key research designs and statistical considerations for incremental validity studies.
- Highlighted challenges in interpreting validity increments and potential criterion artifacts.
Conclusions:
- Proposed steps for building a cumulative research base on incremental validity.
- Discussed challenges in applying general research findings to individual clinical cases.