Person-fit analysis is a technique for determining if the person's results on a given test are valid. The purpose of a person-fit analysis is to detect item-score vectors that are unlikely given a hypothesized test theory model such as item response theory, or unlikely compared with the majority of item-score vectors in the sample. An item-score vector is a list of "scores" that a person gets on the items of a test, where "1" is often correct and "0" is incorrect. For example, if a person took a 10-item quiz and only got the first five correct , the vector would be {1111100000}.
Person-fit analysis is a technique for determining if a person's results on a given test are valid. The purpose of a person-fit analysis is to detect item-score vectors that are unlikely given a hypothesized test theory model such as item response theory, or unlikely compared with the majority of item-score vectors in the sample. An item-score vector is a list of "scores" that a person gets on the items of a test, where "1" is correct and "0" is incorrect. For example, if a person took a ten-item quiz and answered only the first five questions correctly , the vector would be {1111100000}.
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