Quantum mechanics

Test validity

Scale (ratio)

Social psychology

Closeness

Intraclass correlation

Developmental psychology

Power (physics)

Psychometrics

Physics

Correlation

Psychology

Mathematics

Convergent validity

Mathematical analysis

Reliability (semiconductor)

Geometry

Internal consistency

Psychological Assessment

A fundamental dimension along which all social and personal relationships vary is closeness. The Unidimensional Relationship Closeness Scale (URCS) is a 12-item self-report scale measuring the closeness of social and personal relationships. The reliability and validity of the URCS were assessed with college dating couples (N = 192), female friends and strangers (N = 330), friends (N = 170), and family members (N = 155). The results show that the scale is unidimensional, with high reliability across relationship types (M α = .96). Evidence consistent with validity included substantial within-couple agreement for the romantic couples (intraclass correlation = .41), substantial friend-stranger discrimination for the female friends (η² = .82), and measurement invariance across relationship types. Evidence of convergent and divergent validity was obtained for inclusion of other in the self and relational satisfaction, respectively.

The Unidimensional Relationship Closeness Scale (URCS): Reliability and validity evidence for a new measure of relationship closeness.