Chapter 4 Equate groups

This section introduces the concepts and tools needed to link assessments made by different instruments administered across multiple cohorts. Our methodology introduces the idea of an equate group. Systematic application of equate groups provides a robust yet flexible methodology to link different instruments. Once the links are in place, we may combine the data to enable meta-analyses and related methods.

  • What is an equate group? (4.1)
  • Concurrent calibration (4.2)
  • Strategy to form and test equate groups (4.3)
  • Statistical framework (4.4)
  • Common latent scale (4.5)
  • Quantifying equate fit (4.6)
  • Differential Item Functioning (4.7)