One strategy for discovering the connections between social policy interventions and behavioral outcomes is to conduct social experiments that use random assignment research designs. Although random assignment experiments provide reliable estimates of the effects of a particular policy, they do not reveal how a policy brings about its side…

Analysis of variance (ANOVA) designs typically use what is referred to as crossed design to test for differences between means of groups. In a balanced, or crossed, one-way ANOVA, each student (unit of analysis) would have a score in each of the experimental conditions. In a two-way design, the analysis is considered crossed if each level from one…

The type I error control and power of a number of analysis of covariance (ANCOVA) and randomized block (RB) designs with curvilinear data were studied for tests of the additive treatment effect and interaction. For tests of additive effects, the analysis was also conducted using systematic assignment to treatments and using random assignment with…

The purpose of this paper is to articulate the common confusion of correlation for causation. Various articles that have addressed this issue are reviewed, and possible reasons for the misinterpretation of correlation as causation are presented. The differences between correlational and experimental research designs are reviewed, and the…

The basic ideas underlying the Shine-Bower ANOVA for single-subject designs are combined with those of certain repeated measures designs to produce a highly flexible design possessing the advantages of the single-subject and multi- subject approaches to research. Schematic calculation procedures are presented for the two-way case. (Author)

Leakage of experimental information from debreifed subjects into a university subject pool was studied. It was concluded that in settings similar to those of the experiment, leakage of information is not a serious problem. (Authors)

Discusses the need for and design of a National Service Pilot Project. (MC)

When research focuses on the conditions of measurement, the dimensions of the measurement design should be transposed to differentiate conditions while generalizing over persons. To clarify this transposition, the notions of face of differentiation and face of generalization are introduced as complementary aspects of the design. An example is…

Debates the value of experimentation as a tool in educational research. (MK)