Posts Tagged ‘IRT’

IACAT Day #1

Today, I had the distinct privilege of attending and presenting at the first ever meeting of the International Association of Computerized Adaptive Testing.  Wow!  The diversity of theoreticians, practitioners, and supporters of CAT around the globe is fantastic.  We had folks from 30 different countries in attendance.  This is the logical extension of the conferences put together by GMAC […]

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U.S. Supreme Court Rules in Favor of Valid Tests

There have not been too many court cases related to the testing industry that are commonly cited as landmark cases. It is for this reason that the recent decision by the U.S. Supreme Court in The Ricci, et. al. vs. DeStefano, et. al. case may be cited for years to come. In this case, the […]

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The Point-Biserial Correlation Coefficient

One common metric used to assess item quality is the point biserial correlation coefficient (rpb). The “pt bis” as it is sometimes called is the correlation between an item score (1/0) and the total score on a test. Positive values are desirable and indicate that the item is good at differentiating between high ability and […]

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What do you get from a single test item?

If an examinee answers a single test item (aka question) about a specific topic correctly, what can we infer about the examinee’s knowledge of that topic?  Even with the highest quality performance assessment items, the answer is very little. That’s because there are several factors that interact when a test item is presented to an […]

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Item Exposure Control Mechanisms

A few weeks ago, I had the privilege of making the annual trek to the AERA/NCME annual meeting. Typically, I’m quite cynical about this event, but this year I was pleasantly surprised. The program was well done, the presentations were pretty darn good, and the people I chatted with stimulated me. All in all, I […]

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