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…

6 Reasons for Online Essay Marking

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Why online essay marking? Essay questions and other extended…
item banking

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

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Item banking refers to the purposeful creation of a database…

Item Writing Tips

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

How do I conduct a modified-Angoff study?

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There are a number of acceptable methodologies in the psyychometric…

What is Scaling?

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

What is item response theory?

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Item response theory (IRT) represents an important innovation…

The 3 best approaches for IRT equating

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If you are delivering high stakes tests in linear forms - or…