Exploring the Robustness of a Unidimensional Item Response Theory Model With Empirically Multidimensional Data

Unidimensionality and local independence are two common assumptions of item response theory. The former implies that all items measure a common latent trait, while the latter implies that responses are independent, conditional on respondents’ location on the latent trait. Yet, few tests are truly unidimensional. Unmodeled dimensions may result in test items displaying dependencies, which can lead to misestimated parameters and inflated reliability estimates. In this article, we investigate the dimensionality of interim mathematics tests and evaluate the extent to which modeling minor dimensions in the data change model parameter estimates. We found evidence of minor dimensions, but parameter estimates across models were similar. Our results indicate that minor dimensions outside the primary trait have negligible consequences on parameter estimates. This finding was observed despite the ratio of multidimensional to unidimensional items being above previously recommended thresholds.     

Teaching Methods in Higher Education: The Changing Scene,with Special Reference to Small‐group Work

The paper opens with a brief statement of the two conceptual frameworks on which the analysis is based. The author then takes up in turn the five classical methods of shaping students' learning: didactic instruction in the form of lectures; discussion methods; practical work in laboratories, studios etc; provision for the students' private study, including individualized learning techniques and computer‐based methods; and the assessment of students' progress. He outlines the main departures from customary practice in each area, with special attention to small‐group techniques. Finally, since a critical aspect of development is the dissemination of fresh techniques, there is a section on development strategy.     

Dropouts and turnover: The synthesis and test of a causal model of student attrition

The purpose of this research is to investigate the determinants of student attrition in institutions of higher education. A causal model was developed which synthesized research findings on turnover in work organizations and on student attrition. Questionnaires were distributed to university freshmen (N = 1,171). The data was analyzed using multiple regression and path analysis. The regressions produced anR ² = .36 for females and .27 for males. Findings indicate that three surrogate measures for pay were significantly related to intent to leave for both sexes and that the theories and determinants developed in research on turnover are useful in studies of student attrition.Paper presented at the Annual Meeting of American Educational Research Association, San Francisco, April 1979.     

Innovative techniques for advanced writing classes: Modification of point of view

Changing narrators in a literary passage is a pedagogical technique that can enliven composition, yet which still presents a challenge to students. Assuming the original narrator to be omniscient, any new narrator's perception of a situation can only be fragmentary. The challenge lies in giving that new narrator total awareness of events, and in doing so logically. This means rearranging events, modifying the text, and essentially recreating it. The degree of difficulty can be increased by selecting as narrator a character with limited perception of a situation, or one totally absent from the story. For an added dimension of novelty and challenge, the passage can be narrated from the perspective of an inanimate object.His training was in medieval French literature, and he published articles on the chansons de geste in a number of journals over the years. Beginning quite recently, he has become more interested in pedagogy, i.e., the teaching of French, civilization, creative writing, etc. He has written articles that have appeared and are scheduled to appear in such journals as French Review, Contemporary French Civilization, ADFL Bulletin, on such varied topics as Business French, Creative Writing, and the French Liberation. He received his Ph.D. from Stanford University.     

Test Assembly Implications for Providing Reliable and Valid Subscores

This study investigates the relationships among factor correlations, inter-item correlations, and the reliability estimates of subscores, providing a guideline with respect to psychometric properties of useful subscores. In addition, it compares subscore estimation methods with respect to reliability and distinctness. The subscore estimation methods explored in the current study include augmentation based on classical test theory and multidimensional item response theory (MIRT). The study shows that there is no estimation method that is optimal according to both criteria. Augmented subscores show the most improvement in reliability compared to observed subscores but are the least distinct.     

Transfer between nonreward and delay of reward following minimal acquisition training

Four groups of rats were given six acquisition trials under continuous reward, continuous delay of reward, partial reward, or partial delay of reward, following which all Ss received continuous delay. It was found that the partial reward and the partial delay of reward groups were significantly more persistent during the shift phase than the continuous reward group. No differences were found over trials between either the two partial groups or between each one and the continuous delay group.