The Investment Model of Relationship Commitment: Factor Analysis, Reliability, and Validity

Mehdi Ghezelseflo, Sayed-Hadi Sayed-Alitabar, Mozhgan Mirza, Maryam VashghaniFarahani



Background and Objectives: The investment model depicts the theory of interdependence and uses
interconnected structures to analyze the tendency to maintain a relationship. The aim of this study was to examine
the factor structure, reliability and validity of the scale of the investment model of relationship commitment
among couples in Tehran.
Material and Method: This study was a descriptive study with correlation design. Participants included couples
with middle-aged children in Tehran. Cluster random sampling method was used in the study. Data were collected
via the investment model of relationship commitment questionnaire which was developed by Rusbult. To validate
the questionnaire, construct validity, confimatory factor analysis, and convergent validity were used. To test the
reliability of the questionnaire, Cronbach’s alpha and retest reliability coeffiient were used.
Results: Responses of 420 participants, 250 women and 170 men, were analyzed. The Cronbach’s alpha
coeffiient was 0.97 for satisfaction subscales, 0.87 the quality of the alternatives, 0.85 the investment in the
relationship, and 0.67 the marital commitment. Test re-test coeffiient in a two-week interval was 0.94 for the
subscales of satisfaction, 0.86 the quality of the alternatives, 0.82 the investment rate, and 0.67 the personal
commitment. Correlation coeffiients showed that marital adjustment scale had a signifiant correlation of 0.84
with satisfaction subscales, 0.29 substitute quality, 0.55 investment rate, and 0.77 personal commitment, which
indicates a convergent validity, P<0.01. The factor structure of the scale of the investment model was confimed
using a confimatory factor analysis.
Conclusion: The confimatory factor structure, reliability and validity of the investment model of relationship
commitment were acceptable for research and diagnostic applications.


Investment Capital Scale, Reliability, Validity, Factor Structure

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