A Simple Model for Diagnostic Testing when There Are Several Types of Misinformation.

In diagnostic testing one purpose of a test might be to determine whether an examinee has acquired the appropriate skills for solving certain types of problems or whether the examinee is using an erroneous algorithm. In the latter case it is also desired to determine which of several erroneous algorithms is being used so that remedial training can be given. This paper describes a simple latent class model for handling the items in Birenbaum and Tatsuoka’s study (2); included is a description and illustration of how to derive the optimal scoring rule when multiple-choice test items are used.

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