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Wainer, Howard – 1985
It is important to estimate the number of examinees who reached a test item, because item difficulty is defined by the number who answered correctly divided by the number who reached the item. A new method is presented and compared to the previously used definition of three categories of response to an item: (1) answered; (2) omitted--a…
Descriptors: College Entrance Examinations, Difficulty Level, Estimation (Mathematics), High Schools
