Test scoring models vary in their generality, some even adjust for examinees answering multiple-choice items correctly by accident (guessing), but no models, that we are aware of, automatically adjust an examinee's score when there is internal evidence of cheating. In this study, we use a combination of jackknife technology with an adaptive robust…

Subscores can be of diagnostic value for tests that cover multiple underlying traits. Some items require knowledge or ability that spans more than a single trait. It is thus natural for such items to be included on more than a single subscore. Subscores only have value if they are reliable enough to justify conclusions drawn from them and if they…

Confucius pointed out that the first step toward wisdom is calling things by the right name. The term "Differential Item Functioning" (DIF) did not arise fully formed from the miasma of psychometrics, it evolved from a variety of less accurate terms. Among its forebears was "item bias" but that term has a pejorative connotation…

In the course of screening a form of a medical licensing exam for items that function differentially (DIF) between men and women, the authors used the traditional Mantel-Haenszel (MH) statistic for initial screening and a Bayesian method for deeper analysis. For very easy items, the MH statistic unexpectedly often found DIF where there was none.…

Fumiko Samejima is best known for her pioneering work in polytomous response item response theory (IRT), yielding the eponymous model that has been used broadly for more than 30 years. In this interview, Samejima, on the verge of retiring from her faculty position at the University of Tennessee, discusses her life and career. She also describes…

Suggests that because of the nonlinear relationship between item usage and item security, the problems of test security posed by continuous administration of standardized tests cannot be resolved merely by increasing the size of the item pool. Offers alternative strategies to overcome these problems, distributing test items so as to avoid the…

Modified the three-parameter model to include an additional random effect for items nested within the same testlet. Fitted the new model to 86 testlets from the Test of English as a Foreign Language (TOEFL) and compared standard parameters (discrimination, difficulty, and guessing) with those obtained through traditional modeling. Discusses the…

If examinees are permitted to choose to answer a subset of the questions on a test, just knowing which questions were chosen can provide a measure of proficiency that may be as reliable as would have been obtained from the test graded traditionally. This new method of scoring is much less time consuming and expensive for both the examinee and the…

This paper is the transcript of a talk given to those who use test information but who have little technical background in test theory. The concepts of modern test theory are compared with traditional test theory, as well as a probable future test theory. The explanations given are couched within an extended metaphor that allows a full description…

The screening for flaws done for multiple-choice items is often not done for large items. Examines continuous item weighting as a way to manage the influence of differential item functioning (DIF). Data from the College Board Advanced Placement History Test are used to illustrate the method. (SLD)

Discusses the comparison of groups of individuals who were administered different forms of a test. Focuses on the situation in which there is little overlap in content between the test forms. Reviews equating problems in national tests in Canada and Israel. (SLD)

Analysis of the 1991 Law School Admission Test (LSAT) shows that the testlet structure of the reading comprehension and analytic reasoning sections has a significant effect on the statistical characteristics of the test. The testlet-based reliability of these two sections is lower than had been previously calculated. (SLD)

This article summarizes results from tests that have allowed examinee choice of test items. It paints a bleak psychometric picture for the use of examinee choice within fair tests. Choice is anathema to standardized testing unless the aspects that characterize the test are irrelevant to what is being tested. (SLD)

A mathematics item on the Scholastic Aptitude Test (SAT) was found to be faulty and received wide publicity. A detailed investigation into its mathematical and psychometric properties is presented. It was found that the problem could be considered ambiguous but that almost no one noticed the ambiguity. (Author/JKS)

The reliability of scores from four forms of the Test of English as a Foreign Language (TOEFL) was estimated using a hybrid item response theory model. It was found that there was very little difference between overall reliability when the testlet items were assumed to be independent and when their dependence was modeled. (Author/SLD)