IRT Tutorial

1
IRT Tutorial

• University of Illinois at
• Urbana-Champaign

2
The Gang at Illinois

• Sasha Chernyshenko
• David (Siang Chee) Chuah
• Wayne Lee
• Steve Stark
• Patrick Wadlington

3
Groundwork

• Introduction to IRT
• This section will present an introduction to Item
  Response Theory
• Data Preparation for IRT Analyses
• This section will show you how to prepare raw
  data for typical IRT analyses
• Investigation of Dimensionality
• This section briefly describes how to assess the
  dimensionality of your data

4
More Groundwork

• Estimation of IRT Model Parameters
• Procedures on how to estimate item parameters for
  dichotomous and polytomous IRT models
• Assessment of Model-data Fit
• An introduction to graphical and statistical
  methods for assessing model-data fit

5
Applications

• Detection of Differential Item/Test Functioning
  (DIF/DTF) Using IRT
• Investigating item/test bias across
  subpopulations of examinees
• Test Construction Creating Parallel Forms
• This section will contrast classical test theory
  approaches to test construction with IRT-based
  approaches

6
Applications Not Discussed

• Adaptive testing
• e.g., the GRE CAT, CAT-ASVAB
• Identifying mismeasured people
• appropriateness measurement