Vector Psychometric Group offers a full range of psychometric consulting services, from study design consulting to analysis plans to advanced quantitative analyses, such as factor analysis and item response theory, to provide evidence that a scale is providing reliable scores and valid inferences/uses suitable for informing high-stakes decisions.

VPG’s capabilities under the broad heading of psychometric consulting include:

  • Evaluation of existing instruments
    • literature reviews
    • annotated bibliographies
    • assessment of psychometric rigor in publications
  • Scale Development and Item Writing
  • Reviews of study protocols to ensure designs will provide desired psychometric information
  • Item Response Theory analyses
  • Factor analysis
  • Linking scores
  • Group comparison analyses
  • Construct validity analyses
  • Updating/ modifying existing scales
  • Gap analysis for psychometric evidence
  • Scientific writing for quantitative sections of program summary reports/dossiers
  • Data collection and scoring
    • Real-time IRT-based Scoring via the Adaptest® plugin
    • Computerized Adaptive Testing via the Adaptest® plugin
    • Learn more about Adaptest®