Posts on psychometrics: The Science of Assessment

cognitive diagnostic models

What are cognitive diagnostic models?

Cognitive diagnostic models are an area of psychometric research…
item response theory

How do I implement item response theory?

I recently received a email from a researcher that wanted to implement…

Guttman Errors: Additional Insight into Examinees

Guttman errors are a concept derived from the Guttman Scaling…
student essay rubric

What is a rubric?

What is a rubric? It's a rule for converting unstructured responses…

6 Reasons for Online Essay Marking

Why online essay marking? Essay questions and other extended…

What is Item Banking? How can it improve my assessment?

Item banking refers to the purposeful creation of a database…
psychometrics in a fog

What is psychometrics supposed to be doing?

Today I read an article in The Industrial-Organizational Psychologist…

Item Writing Tips

With so many things to consider, it’s no wonder psychometricians…

How do I conduct a modified-Angoff study?

There are a number of acceptable methodologies in the psyychometric…

What is Scaling?

I often hear this question, especially regarding the scaled scoring…