(well, it always is…)
Keep on reading for easy-to-digest articles on psychometric topics, industry news, and guest posts from experts.
The British statistician George Box is credited with the quote, “All models are wrong but some are useful.” As psychometricians, it is important that we
Cognitive diagnostic models are an area of psychometric research that has seen substantial growth in the past decade, though the mathematics behind them, dating back
I recently received a email from a researcher that wanted to implement item response theory, but was not sure where to start. It occurred to me
Guttman errors are a concept derived from the Guttman Scaling approach to evaluating assessments. There are a number of ways that they can be used.
What is a rubric? It’s a rule for converting unstructured responses on an assessment into structured data that we can use psychometrically. Why do we
Why online essay marking? Essay questions and other extended constructed response (ECR) items remain a mainstay of educational assessment. From a purely psychometric perspective, they
Test security is an increasingly important topic. There are several causes, including globalization, technological enhancements, and the move to a gig-based economy driven by credentials.
Item banking refers to the purposeful creation of a database of assessment items to serve as a central repository of all test content, improving efficiency
Today I read an article in The Industrial-Organizational Psychologist (the colloquial journal published by the Society for Industrial Organizational Psychology) that really resonated with me. Has
With so many things to consider, it’s no wonder psychometricians often recommend the retirement of poor performing items. Here are some of the most common
I just returned from the 2017 Innovations in Testing conference in Scottsdale, AZ, organized by the Association of Test Publishers. This is one of my favorite
There are a number of acceptable methodologies in the psychometric literature for standard-setting studies, also known as cutscores or passing points. Some examples include Angoff,
Background of the Certification/Recertification Report The National Commission for Certifying Agencies (NCCA) is a group that accredits certification programs. Basically, many of the professional
I often hear this question about scaling, especially regarding the scaled scoring functionality found in software like FastTest and Xcalibre. The following is adapted from
Item response theory (IRT) represents an important innovation in the field of psychometrics. While now 50 years old – assuming the “birth” is the classic
