The Key to Objective Measurement
نویسنده
چکیده
The property that Rasch recognised can be understood by considering two persons A and B with imagined abilities βA and βB. If these two persons attempt a set of test items, and a tally is kept of the number of items N10 that person A answers correctly but B answers incorrectly, and of the number of items N01 that person B answers correctly but A answers incorrectly, then under the Rasch model, the difference βA-βB in the abilities of these two persons can be estimated as:
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