This study evaluated the use of bivariate matching as a solution to the problem of studying differential item functioning (DIF) with formula scored tests. Using Scholastic Aptitude Test verbal data with large samples, both male/female and black/white group comparisons were investigated. Mantel-Haenszel (MH) delta-(D) DIF values and DIF category…

This study describes intergroup guessing differences in response to tests and to test-like tasks. It is a composite of seven component inquiries with three substudies in Phase 1 and four in Phase 2. These seven studies cover the Graduate Record Examination (GRE) item-type domain from a number of viewpoints relevant to implicit guessing behavior.…

Technical improvements, which may be made in the reliability and validity of tests through confidence scores, are discussed. However, studies indicate that subjects do not handle their confidence uniformly. (MS)