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A brief inventory of Interpersonal Problems-Circumplex using nonparametric item response theory: introducing the

Sandro M Sodano1, Terence J G Tracey

  • 1Department of Counseling, School and Educational Psychology, State University of New York, Buffalo, 14260-1000, USA. smsodano@buffalo.edu

Journal of Personality Assessment
|December 25, 2010
PubMed

Insights

A new 32-item Inventory of Interpersonal Problems-Circumplex scale was developed using nonparametric item response theory. This brief scale accurately assesses interpersonal problems without gender bias.

Area of Science:

  • Psychology
  • Psychometrics

Background:

  • The Inventory of Interpersonal Problems-Circumplex (IIP-C) is a widely used measure.
  • Developing brief versions of the IIP-C is essential for efficient assessment.

Purpose of the Study:

  • To develop and validate an abbreviated 32-item version of the Inventory of Interpersonal Problems-Circumplex (IIP-C).
  • To ensure the brief scale maintains psychometric integrity and avoids gender bias.

Main Methods:

  • Nonparametric item response theory was applied to data from 1,000 college students.
  • A validation sample of 981 students was used to assess differential item functioning and scale convergence.
  • The new scale's fit to the circular structural model was compared to existing versions.

Main Results:

  • The new 32-item scale demonstrated high convergence with the full IIP-C scales.
  • No evidence of differential item functioning was found between males and females.
  • The brief scale showed commensurate or improved model fit compared to existing brief derivatives.

Conclusions:

  • The new abbreviated IIP-C scale provides a precise and informative brief assessment of interpersonal problems.
  • The scale is suitable for use across genders, offering a reliable alternative to longer or existing brief versions.

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