Year Published: 2015

Time to Complete: 60 min

Instructor: Barbara Gandek, PhD

Learning Level: Fundamental

Primary Audience: Researchers

Prerequisite: None

Skills Domain: Scientific Concepts and Research Design

Interested in learning how to incorporate Item Response Theory (IRT) in your research surveys?

Use Item Response Theory, a model-based measurement to overcome traditional measurement approaches. This seminar will include information about developing and evaluating item banks, and more information about IRT models.

Learning Objectives

After completing this course, you will be able to:

  • Identify the major differences between classical and modern psychometric methods
  • Understand the process of developing and evaluating a PRO item bank using modern IRT methods
  • Describe how item banks are used in computerized adaptive testing (CAT)
  • Discuss how information from item banks can be helpful in constructing new fixed-length PRO surveys.

Content Outline

  • How are Patient Centered Outcomes Survey Used
  • Differences Between Classical and Modern Psychometric Methods
  • Fixed Length Surveys
  • What is Item Response Theory
  • Steps for Evaluating Item Banks
  • Confirmatory Factor Analysis
  • Local Item Independence
  • Response Choices and Intervals
  • Probability of an Item Response Differential Item Functioning DIF
  • Types of Item Response Theory IRT Models
  • Item Information
  • What is Computerized Adaptive Testing CAT
  • CAT Examples
  • Crosswalks Across Instruments
  • Using Item Bank Information
  • Final Comments


  • Lecture Slide Deck (PDF)

Course Evaluation

  • Post-Course Evaluation
  • Course Completion Verification
 This Course is Free