Simultaneous Linking of Cross-Informant and Longitudinal Data Involving Positive Family Relationships

Area of Science:

• Psychometrics
• Developmental Psychology
• Family Studies

Background:

• Measurement invariance is crucial for valid cross-group and longitudinal comparisons.
• Previous research developed a mother-reported scale for positive family relationships using item response theory.
• A validated scale for children's reports was lacking.

Purpose of the Study:

• To develop and validate a measure of positive family relationships for children.
• To establish measurement invariance across informants (mothers and children) and time.
• To investigate the stability of positive family relationships from childhood to adolescence.

Main Methods:

• Applied simultaneous parameter linking to cross-sectional and longitudinal data from the Fullerton Longitudinal Study (N=9 annual assessments, ages 9-17).
• Utilized item response theory, specifically the nominal response model, for scale development in children.
• Linked mother and child reports concurrently and prospectively.

Main Results:

• Achieved measurement invariance for positive family relationships across informants and time.
• Demonstrated significant concordance between mother and child reports of positive family relationships.
• Confirmed the stability of individual differences in positive family relationships over an 8-year period.

Conclusions:

• The novel psychometric approach successfully established measurement invariance for positive family relationships in children and mothers.
• The findings support the reliability and validity of measuring this construct across different reporters and over time.
• This methodology provides a robust foundation for future research on family dynamics and child development.