Cluster-randomized trials have been widely used to evaluate the treatment effects of interventions on student outcomes. When interventions are implemented by teachers, researchers need to account for the nested structure in schools (i.e., students are nested within teachers nested within schools). Schools usually have a very limited number of…

Comprehensive evaluation of treatment effects is aided by considerations for moderated effects. In educational research, the combination of natural hierarchical structures and prevalence of group-administered or shared facilitator treatments often produces three-level partially nested data structures. Literature details planning strategies for a…

Many experimental designs in educational and behavioral research involve at least one level of clustering. Clustering affects the precision of estimators and its impact on statistics in cross-sectional studies is well known. Clustering also occurs in longitudinal designs where students that are initially grouped may be regrouped in the following…

Single subject (SS) designs are popular in educational and psychological research. There exist several statistical techniques designed to analyze such data and to address the question of whether an intervention has the desired impact. Recently, researchers have suggested that generalized additive models (GAMs) might be useful for modeling…

The Institute of Education Sciences has funded more than 100 experiments to evaluate educational interventions in an effort to generate scientific evidence of program effectiveness on which to base education policy and practice. In general, these studies are designed with the goal of having adequate statistical power to detect the average…

Educational researchers commonly use the rule of thumb of "design effect smaller than 2" as the justification of not accounting for the multilevel or clustered structure in their data. The rule, however, has not yet been systematically studied in previous research. In the present study, we generated data from three different models…

This study deals with the statistical properties of a randomization test applied to an ABAB design in cases where the desirable random assignment of the points of change in phase is not possible. To obtain information about each possible data division, the authors carried out a conditional Monte Carlo simulation with 100,000 samples for each…

Gives an overview of three of the myths that F. N. Kerlinger (1959, 1960) identified as pervading educational research. Explores the myths of methods, practicality, and statistics, and analyzes the degree to which they have been overcome or still exist. (SLD)

A paradigm for experimental studies of conversation training is developed. This paradigm offers a way of interpreting conservation training studies as well as suggesting several fertile areas for future studies. (Editor)

This study investigated the relationship between students' prior learning (knowledge in a content area) and their level of achievement on criterial tests measuring different educational objectives when receiving instruction via programmed booklets complemented by visuals possessing varying degrees of realistic detail. (Author/RK)

This study was completed to determine whether efficiency in concept attainment can be increased as a function of the interaction of the use of good negative instances and increased attention defined in terms of risk conditions. (Author)

Describes a method of dealing with partially-responded-to questionnaires in survey research which utilizes nonparametric Bayesian discriminant analysis to predict missing responses based on "profiles" of the partial and the "complete" respondents. Some background of nonresponse bias in survey research is discussed, and two other methods of dealing…

The purpose of this study is to determine the relationship between the motivation level of the student and his respective class size. Furthermore, if a relationship does exist, is this relationship reflected in the student's evaluation of the course's effectiveness. (Author)

A review and meta-analysis were made of placebo control groups in educational experiments. In all, 125 studies were clustered into procedures that included (1) explicit manipulation of attentional elements; (2) explicit description of the placebo activity plus implied reference to attention; and (3) exclusive reference to the activity. (SLD)