The intent of this experimental program is to test the impact of an assistance system on issues such as work incentive, cost of benefits, administrative costs, and other corollary issues. The structure is to provide assistance that increases as earned income declines, and decreases as earned income increases. Unlike the President's Welfare Reform…

The Distar I Reading, Language and Arithmetic programs were used with two first grade classes. The Distar II programs were used with two second grade classes. One first grade Distar class appeared to make some progress in oral language. Comparison of the first grade Distar classes with a first grade control class that used a Scott-Foresman basal…

Matching, randomization, random sampling, and other methods of controlling extraneous variation are discussed. The purpose was to specify the benefits of randomization in estimating causal effects of treatments. It is concluded that randomization should be employed whenever possible, but the use of carefully controlled nonrandomized data to…

Research was conducted relevant to two questions: First, does generalized imitation reflect the child's failure to discriminate reinforced from non-reinforced occasions? Second, are the results which characterize generalized imitation a function of confounded social and instructional influences that operate within the procedures used in…

The Canadian Public Service Commission conducted an experimental course using the communication technology satellite for the experimental group and a conventional classroom for the control group. Both groups of forty managers had the same subject matter and used the same student-directed learning methodology. The article contains observations on…

It is difficult to conduct randomized field experiments. In the past decade, the use of alternative randomization plans and incentives has contributed to their operational feasibility; legal, ethical, and professional arguments for experimentation have matured; and expectations have become better aligned with practical constraints that are likely…

The estimation and evaluation of the effects of alternative educational or social policies is a major purpose of decision oriented, comparative evaluation studies. This paper reviews the rationale underlying the definition and interpretation of various measures of effect magnitude and examines their relevance to evalution research. (Author)

This article discusses the circumstances under which unequal sample size in the two-group study can arise and result in an attenuated point-biserial correlation. Formulas are provided for correcting the coefficient either directly or through the mediation of relevant statistics found in studies where the coefficient itself is not reported.…

This paper is concerned with the construction of effect size standard errors in situations where the effect sizes are independent but the data have likely been sampled from non-normal distributions, and possibly for different studies, from different families of non-normal distributions. Asymptotic distribution-free estimators are provided for two…

Compares academic results of teaching an experimental class of sophomores using a methodology of dyadic mode learning with a control class of sophomores and examines the potential uses and characteristics of the group relationships in dyadic mode learning for university level work in a full semester's courses. (Author/RK)

There is currently a great deal of controversy about a critical issue in educational research: What constitutes valid evidence for determining whether educational innovations are effective? One side of the controversy is reflected in the U.S. Department of Education's current policies and funding programs. This side emphasizes methodological…

Within-class experimental designs (with experimental and control groups in the same classroom) are subject to diffusion effects whereby both experimental and control students benefit from the intervention, thereby contaminating the control group and biasing evaluations of intervention effects. In support of diffusion effects, this study shows that…

The experimental treatment was more effective in increasing vocational development than either the individual counseling or control treatments, and individual counseling was more effective than the control treatment. No differences were found among groups in regard to individual counselors, sex of students, or in student counseling assessments.…

This research was aimed at adapting the Utah State University Classroom Management Program for use in elementary mainstreaming classrooms and evaluating the program's effectiveness in changing teacher and pupil behavior. The program appears to be powerful in changing teacher behavior and an effective classroom management training tool. (Author/AL)