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Abstract
Person‐fit is a statistical index that can be used as a direct measure of assessment accuracy by analysing response patterns and identifying individuals with aberrant or unusual responses with respect to a testing model. For these individuals test scores may be an inaccurate measure of their true ability. To comprehend person‐fit and its relationship with other variables in testing, four personality tests for mathematics were applied and their relationships with person‐fit were investigated. The four tests assessed were attitude toward maths, level of maths anxiety, level of test anxiety, and level of motivation to learn maths. The person‐fit statistic was estimated using the standardised log‐likelihood statistics (lZ ). Participants were 1075 tenth‐grade students from one school district in the south of Jordan. Results showed that motivation toward learning maths has the strongest relationship with person‐fit followed by test anxiety. While a student’s ability measured by total score has no effect on person‐fit, maths anxiety and attitude toward maths definitely have some effect on it. The results of this study also showed the usefulness of person‐fit procedure in understanding students’ performance in tests.