ASC 2022 Logo no tagline 300
Contact Us
ASC 2022 Logo no tagline 300
Contact Us
assessment systems logo
Contact Us

IRT DIF
Graphing Tool

Visualize Differential Item Functioning

differential item functioning output

The IRT DIF Graphing Tool is an Excel spreadsheet designed to help you visualize and evaluate the presence of differential item functioning (DIF) based on item response theory (IRT).  It is meant as a post-hoc tool for analysis that is done with other software, such as DFIT.

How does it work?

  1. Analyze DIF with specialized software like DFIT or PARSCALE.  You will have output that gives item parameters for your two groups.
  2. Paste the item parameters into this spreadsheet.
  3. Evaluate the graphics – they will all populate in real time, no configuration or “running” of a program required.

Request Download of IRT DIF Graphing Tool


First name*

Last name*



You must enter a valid email to receive the download link.



Name of your company, university, or other organization.










ASC-2022-logo-tagline-2
Facebook-f Twitter Linkedin-in Youtube

ONLINE TESTING SOLUTIONS

PSYCHOMETRIC SOFTWARE

PSYCHOMETRIC SERVICES