Conclusions about levels and trends in high school dropout differ dramatically depending on whether dropout is measured using data from the Current Population Survey (CPS) or from the Common Core of Data (CCD). Using CPS- and CCD-based drop-out measures for 16- to 19-year-olds--which differ solely in their estimates of the number of 16- to…

In the fall of 2003, Teaching Support Services (TSS), a department at the University of Guelph, was approached by a faculty member in the department of food sciences. Professor Art Hill was interested in seeking support in systematically assessing the department's undergraduate curriculum and using that assessment to trigger further improvement of…

Background: Cornelia-de-Lange syndrome is a rare congenital syndrome with poor social relatedness as one of several characteristics of its behavioural phenotype. Methods: Video observations were collected from seven children in their first year of life and again with age 2-4 years. Data were analysed for distribution of object-related and social…

Although acquisition criteria are a fundamental issue for SLA research, they have not always been adequately defined or elaborated in the literature. This article critically scrutinizes one such criterion, the emergence criterion, proposing an explicit, operational definition. After discussing emergence as a theoretical construct, the article…

This study examines four months of online discourse of 22 Grade 4 students engaged in efforts to advance their understanding of optics. Their work is part of a school-wide knowledge building initiative, the essence of which is giving students collective responsibility for idea improvement. This goal is supported by software--Knowledge…

American Indian/Alaska Native well-being, survival-based data are rare. This study explores the question of whether or not it is possible to produce such well-being information using secondary data sources. The answer is yes, with some limitations. Hence, Native American data for 10 well-being indicators nationally and for New Mexico and South…

Collecting data and analyzing the results of experiments is difficult for children. The authors found a surprising way to help their third graders make graphs and draw conclusions from their data: digital photographs. The pictures bridged the gap between an abstract graph and the plants it represented. With the support of the photos, students…

Rates of suicide by jumping show large regional differences. Barriers on bridges may prevent suicides but also may lead to a substitution of jumping site or method. The aim of our study was to compare suicide data from regions with and without suicide bridges and to estimate the effects on method and site substitution if bridges were to be…

Hierarchical data analyses in different discipline areas are reviewed in this article to compare statistical applications between the Hierarchical Linear Model (HLM) software and the Statistical Analysis System (SAS) MIXED procedure. Similar features of the two software programs are illustrated through reconfirmation of an HLM example using the…

Two experiments investigated developmental differences in attention allocation and attention-sharing in a dual-task paradigm using Performance Operating Characteristics (POC) as an innovative data analysis method. In Experiment 1, attention allocation was assessed. Two visual detection tasks were presented to 20 second- and 11 fifth-graders who…

Understanding the effects of additive and multiplicative constants on basic statistical procedures provides the important groundwork necessary for a thoughtful and logical understanding of more complex methods. This paper explores the effects of additive and multiplicative constants on the mean, standard deviation, skewness, kurtosis, and…

ORDMET is applicable to structures obtained from additive conjoint measurement designs, unfolding theory, general Fechnerian scaling, types of multidimensional scaling, and ordinal multiple regression. A description is obtained of the space containing all possible numerical representations which can satisfy the structure, size, and shape of which…

The present research was designed to investigate the relationship between binary units of information and the subjective use made of them. (Author)

The purpose of the present experiment was to manipulate independently the number of lists learned and the criterion of learning, to determine how each of these variables and their interaction influence nonspecific transfer. (Author)

The present experiment was addressed to the study of one aspect of nonspecific transfer, namely, whether the processes involved in the test trails during acquisition are related to subsequent nonspecific transfer. (Author)