As a practitioner who has worked with youngsters with attention deficit hyperactivity disorder (ADHD) for the past 30 years, the author has done her best to stay current with the research literature on ADHD, particularly intervention research. However, she was always bothered by one nagging thought. Sure, there is good research to show effective…

A realistic applied chemical engineering experimental design and statistical analysis project is documented in this article. This project has been implemented as part of the professional development and applied statistics courses at Villanova University over the past five years. The novel aspects of this project are that the students are given a…

In practice, the inclusion of correlated residuals in latent-variable models is often regarded as a statistical sleight of hand, if not an outright form of cheating. Consequently, researchers have tended to allow only as many correlated residuals in their models as are needed to obtain a good fit to the data. The current article demonstrates that…

In basic science research, student researchers are often challenged with not only the technical portion of the research design but also the team dynamic. Understanding how a student prefers to learn can provide an advantage for mentors to better meet these challenges. In this article, the authors describe the experience of working with student…

Gender differences in speed of perceptual comparison, of picture-plane mental rotation, and in switching costs between trials that do and do not require mental rotation, were investigated as a function of stimulus material with a total sample size of N=360. Alphanumeric characters, PMA symbols, animal drawings, polygons and 3D cube figures were…

"Theory as Method: Small Theories of Treatments," by Mark W. Lipsey, is one of the most influential and highly cited articles to appear in "New Directions for Evaluation." It articulated an approach in which methods for studying causation depend, in large part, on what is known about the theory underlying the program. Lipsey discussed the benefits…

People with autistic spectrum disorders (ASD) have difficulties in recalling recently experienced events, which is dependent upon intact functioning of several aspects of "self awareness". The current study examined impaired episodic recall in ASD and its relationship to specific impairments in aspects of "self awareness". Between-group…

Most researchers using analysis of variance (ANOVA) use a fixed-effects model. However, a random- or mixed-effects model may be a more appropriate fit for many research designs. One benefit of the random- and mixed-effects models is that they yield more generalizable results. This paper focuses on the similarities and differences between the…

Three experimental design issues are examined in relation to the appropriate unit of analysis. Independent replication of the treatments for each subject, independence of observations when gathering dependent variable data, and randomization of groups of subjects are factors that can affect the statistical model and interpretation of results.…

TO ASCERTAIN THE SIGNIFICANCE OF RESEARCH IN EDUCATION, THREE QUESTIONS MAY BE ASKED--(1) TO WHAT EXTENT HAS THE BEHAVIOR OF INDIVIDUALS IN EDUCATION BEEN CHANGED. (2) HOW MANY ARTICLES HAVE BEEN WRITTEN AS A RESULT OF THE FINDINGS. (3) TO WHAT EXTENT DO EDUCATORS TALK ABOUT OR USE THE CONCEPTS GENERATED BY THE RESEARCH IN DISCUSSING THEIR OWN…

A research design is used to find out how effective a given piece of research has been. This short course in the fundamentals of research design is intended to bring together a few typical examples and a few generally accepted principles of research in a practical kit. After a brief introduction on how to progress from data that is uncountable to…

It would be very helpful in retrieval experiments if good retrieval performance for a test collection was known, so that performance for particular devices could be fully evaluated. This paper presents one performance yardstick, based on optimally weighted request terms, and illustrates its application to different test collections. (Author)

It is suggested that Levy's procedure for testing predicted trends in independent correlations should not produce grossly incorrect inferences when one is dealing with the sorts of correlations which are ordinarily encountered in empirical research. (Author/JKS)

The E (for Euclidean) correlation coefficient is introduced as a general formulation of a variety of measures of association. Characteristics of the coefficient are discussed, and 23 measures of association are shown to be or not be E coefficients. (JKS)