Posts on psychometrics: The Science of Assessment

validity threats psychometrics

What validity threats are relevant to psychometric forensics?

Validity, in its modern conceptualization, refers to evidence…

Assessment Systems Named INC 5000 Fasted Growing Companies

Assessment Systems Ranks No. 807 on the 2017 Inc. 5000 America’s…
item difficulty

What is classical item difficulty (P value)?

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One of the core concepts in psychometrics is item difficulty.  This…
psychometric forensics, conference on test security, data forensics, test fraud

Examinee Collusion: Primary vs Secondary

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It's October 30, 2017, and collusion is all over the news today...…
machine learning in psychometrics

Machine Learning in Psychometrics: Old News?

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In the past decade, terms like machine learning, artificial intelligence,…
psychometric forensics, conference on test security, data forensics, test fraud

Can we call it Psychometric Forensics?

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An emerging sector in the field of psychometrics is the area…
cognitive diagnostic models

What are cognitive diagnostic models?

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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

Guttman Errors: Additional Insight into Examinees

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

What is a rubric?

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