# On Dimensionality, Measurement Invariance, and Suitability of Sum Scores for the PHQ-9 and the GAD-7

> Research article (Assessment, 2020) · cited 103× · AI/ML

**Wikidata**: [openalex:W3030508608](https://www.wikidata.org/wiki/openalex:W3030508608)  
**Source**: https://4ort.xyz/entity/on-dimensionality-measurement-invariance-and-suitability-of-sum-scores-for-the-phq-9-and-the-gad-7