Entries by nthompson

What are the possible transformations for scaled scoring?

I was recently asked about scaled scoring and if the transformation must be based on the normal curve. This is an important question, especially since most human traits fall in a fairly normal distribution, and item response theory places items and people on that latent scale. The short answer is “no” – there are other […]

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What is computerized adaptive testing?

Computerized adaptive tests (CATs) are a sophisticated method of test delivery based on item response theory (IRT). They operate by adapting both the difficulty and quantity of items seen by each examinee. Difficulty Most characterizations of adaptive testing focus on how item difficulty is matched to examinee ability. High ability examinees receive more difficult items, […]

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What is a standard setting study?

A Standard Setting Study is a formal process fo establishing an performance standard. In the assessment world, there are actually two uses of the word standard – the other one refers to a formal definition of the content that is being tested, such as the Common Core State Standards in the USA. For this reason, […]