Accuracy of Random Groups Equating with Very Small Samples

This study investigated the effectiveness of equating with very small samples using the random groups design. Of particular interest was equating accuracy at specific scores where performance standards might be set. Two sets of simulations were carried out, one in which the two forms were identical and one in which they differed by a tenth of a standard deviation in overall difficulty. These forms were equated using mean equating, linear equating, unsmoothed equipercentile equating, and equipercentile equating using two through six moments of log-linear presmoothing with samples of 25, 50, 75, 100, 150, and 200. The results indicated that identity equating was preferable to any equating method when samples were as small as 25. For samples of 50 and above, the choice of an equating method over identity equating depended on the location of the passing score relative to examinee performance. If passing scores were located below the mean, where data were sparser, mean equating produced the smallest percentage of misclassified examinees. For passing scores near the mean, all methods produced similar results with linear equating being the most accurate. For passing scores above the mean, equipercentile equating with 2- and 3-moment presmoothing were the best equating methods. Higher levels of presmoothing did not improve the results.     

Structuring the Classroom for Performance: Cooperative Learning with Instructor‐Assigned Teams*

The main concern is a longstanding one in classroom instruction—the determinants of effective team performance. The paper explicitly examines the effect of teacher‐controlled factors on the use and functioning of student teams. From a sample of 500 undergraduate students, data are obtained on aptitude, diversity, instability, motivation, personality style, size, and performance. The regression results suggest that team motivation and instability, which are both partly controlled by the instructor, are particularly important in determining a team's performance. An implication is that instructor decisions about team make‐up and incentives can have a significant impact on student achievement.     

The effects of physical structure and semantic organization on the recall of prose

The effects of a prose passage's physical structure and semantic organization upon free recall performance was investigated. Passages, describing characteristics of fictitious countries, contained either five or nine paragraphs on attributes of the countries. Results showed that Mandler's in J. L. Cowan (Ed.), Studies in thought and language. Tucson: University of Arizona Press, 1970] organizational limits could apply to prose as well as word lists and could be used to explain previous discrepant results in semantic organization research. Results showed differences in the distribution of materials interacting with type of semantic organization to produce differences in recall. Different learning strategies imposed by the passage's semantic organization were also found.     

Putting the “Is for” Back into the Study of Cognition and Behavior: Commentary on “Unifying Themes for Educational Psychology”

Understanding human behavior situated in a classroom context has traditionally been the domain of educational psychology. This rich tradition continues today, but in a fragmented manner. This fragmentation is undoubtedly the result of a number of factors, but two contributing factors that come readily to mind are (a) the demise of grand theories and (b) the increase in multidisciplinary research efforts. In some respects, the former may be a function of the latter. Regardless, multidisciplinary efforts will continue to increase simply due to the complexity of the problems we are addressing. However, the major significance of the Dempster and Corkill paper is the call for unifying themes couched within a biological system that focuses on personal knowledge construction through the process of learning. In many respects this is a clarion call for a reconsideration of the theoretical roots of functionalism from which educational psychology sprang.     

The course as token: A construction of/by networks

In actor-network theory (ANT) the movement from the instability of science-in-the-making to the relative stability of ready-made-science is followed by tracing the path of a token or focal actor (either human or non-human) as it both constructs a network and is simultaneously transformed by the developing network. Within science education, a new course can be seen to be a token. It undergoes various transformations as it simultaneously changes those who encounter it (teachers, students, and interested actors beyond the school) and is changed by those same actors. This paper describes the way a new applied physics course introduced in British Columbia as part of a program in applied academics can be seen to construct different networks in different contexts and, in the process, to take on significantly different characteristics. Data are collected from interviews and observations in two different settings characterized in part by differences in the types of partnerships developed with industry, labour, and post-secondary groups. The success of the applied physics course in challenging traditional forms of school physics is seen to rely on the size and strength of the network in which it is imbedded.     

Expressive Vocabulary Predicts Nonverbal Executive Function: A 2-year Longitudinal Study of Deaf and Hearing Children

Numerous studies suggest an association between language and executive function (EF), but evidence of a developmental relationship remains inconclusive. Data were collected from 75 deaf/hard-of-hearing (DHH) children and 82 hearing age-matched controls. Children were 6–11 years old at first time of testing and completed a battery of nonverbal EF tasks and a test of expressive vocabulary. These tasks were completed again 2 years later. Both groups improved their scores on all tasks over this period. DHH children performed significantly less well than hearing peers on some EF tasks and the vocabulary test at both time points. Cross-lagged panel models showed that vocabulary at Time 1 predicted change in EF scores for both DHH and hearing children but not the reverse.