Provides a thorough grounding in the theory behind modern aptitude and achievement tests. Until now, there has been no single source from which the reader could get the derivations, formulas, and fundamental ideas which would enable him to understand the tests and use them intelligently.Dr. Gulliksen stresses the reasoning which led to the basic formulas of test theory, and gives completely worked-out derivations for these formulas. Detailed derivations like these are difficult to find, and Dr. Gulliksen feels they are essential to a real understanding of aptitude and achievement tests of all types.

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