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By Howard Wainer

This celebrated primer offers an creation to all the key elements in realizing automated adaptive trying out expertise, try improvement, statistics, and psychological attempt thought. according to years of analysis, this obtainable e-book educates the amateur and serves as a compendium of state of the art info for pros attracted to automatic checking out within the components of schooling, psychology, and different comparable social sciences. A hypothetical try out taken as a prelude to employment is used as a typical instance all through to spotlight this book's most crucial positive aspects and difficulties. adjustments within the new version comprise: *a thoroughly rewritten bankruptcy 2 at the process issues wanted for contemporary automated adaptive trying out; *a revised bankruptcy four to incorporate the most recent in method surrounding on-line calibration and within the modeling of testlets; and *a new bankruptcy 10 with important info on how try goods are fairly chosen, utilization styles, how utilization styles impression the variety of new goods required, and instruments for coping with merchandise swimming pools.

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Howard Wainer Princeton, NJ Page xxiv This page intentionaly left blank. Page 1 1 Introduction and History Howard Wainer PROLOGUE As we approach the end of the twentieth century we see the influence of computers all around us. In the 1970s computers worked behind the scenes to balance books, write paychecks, prepare weather reports, and do any number of tasks whose characteristics usually included odious repetitive operations. In the 1980s there was a change. Computers came out of the basement.

Happily, our proposal was accepted and so began a long collaboration with NPRDC. The Technical Manual documented the work that had been done on CAT in general, and on the CAT-ASVAB in particular. It was (and is) a very long and technical document, which was (and is) incomplete. There is still much work remaining before the CAT-ASVAB is fully documented. Nevertheless, this technical manual provided for the first time a structured statement of what it takes to field a viable CAT. The CAT-ASVAB is a pioneering (even a visionary) effort, and therefore such a structured presentation provided a view of both what has been completed, and what remains yet to be done.

The computer developments of the past decade made the Page xxiii earlier version sufficiently archaic that nothing less than a complete rewrite would suffice. I am delighted that Bert Green agreed to do it. In chapter 4 we have updated the methodology surrounding online calibration to be consonant with current knowledge. We have also included an introduction to the most recent development in the modeling of testlets. This work allows CATs to contain testlets that are constructed on the fly by the item selection algorithm and still estimate the parameters accurately.

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