The traditional concept of validity divides it into three separate types; content, criterion, and construct validities. This view is fragmented and incomplete, failing to take into account evidence of the value implications of score meaning as a basis for action and of the social consequences of score use. The new unified concept of validity…

A test of statistical significance is a procedure for determining how likely a result is assuming a null hypothesis to be true with randomization and a sample of size n (the given size in the study). Randomization, which refers to random sampling and random assignment, is important because it ensures the independence of observations, but it does…

This study compared the model of J. E. Grizzle, C. F. Starmer, and G. G. Koch (GSK, 1969) and log-linear model-based approaches for testing hypotheses in r x c contingency tables. Tables were simulated under various conditions of table, sample, row-effect size, and column-effect size. Test statistics for column (main) and interaction effects were…

P. O. Johnson and J. Neyman (1936) proposed a general linear hypothesis testing procedure for testing the null hypothesis of no treatment difference in the presence of some covariates. This is generally known as the Johnson-Neyman (JN) technique. The need for the hypothesis testing step (often omitted) as originally presented and the…

The wide availability of large amounts of inexpensive computing power has encouraged statisticians to explore many approaches to a basis for inference. This paper presents one such "computer-intensive" approach: the bootstrap of Bradley Efron. This methodology fits between the cases where it is assumed that the form of the distribution…

Findings of a study on the relation between 6-year-olds' attachment security and their mental representations of attachment relationships are reported. It was expected that infants whose attachment behavior seemed disorganized would be fearful of their attachment figures and experience themselves as helpless, and that these conditions would be…

This paper discusses several interrelated processes aimed at helping teachers to use an experimental approach to improve their teaching. In making a diagnosis, the teacher generates a hypothesis about the relationship between his/her potential behavior and its effect upon the students. Following the formulation of such a hypothesis, the teacher…

Conjunctive item response models are introduced such that (a) sufficient statistics for latent traits are not necessarily additive in item scores; (b) items are not necessarily locally independent; and (c) existing compensatory (additive) item response models including the binomial, Rasch, logistic, and general locally independent model are…

This study was conducted to determine if viewing a commercially prepared videotape containing written and aural subliminal messages was more effective at producing weight loss than a videotape containing the same content, but without the subliminals. Participants included undergraduate and graduate students from Iowa State University (N=51) who…

A collective assessment of the comparative study of foreign policy as a field of scholarly inquiry is presented. An effort is made to interpret the field's boundaries, to review its accomplishments, and to propose some future directions. The first section, in which the field's scope and boundaries are discussed, asserts that the boundaries are…

A common problem in the behavioral sciences is to determine if a set of observed variables can be more parsimoniously represented by a smaller set of derived variables. To address this problem, the performance of five methods for determining the number of components to retain (Horn's parallel analysis, Velicer's Minimum Average Partial (MAP),…

Building communication theory in terms of three-variable relationships is a promising route to developing better theory, because three-variable relationships stand midway between sometimes overly simplistic two-variable relationships, and the more complex path analysis. The analysis of three-variable relationships has been done in many previous…

This study evaluated the effectiveness of an expert instructional system used to provide timely and quality feedback about the quality of a variety of visual materials production techniques to undergraduate students in a basic instructional materials production class. One group of students generated its own feedback by using the expert system, and…

A content analysis was performed on all of the BBC (British Broadcasting Corporation) Nine O'Clock News and ITV (Independent Television) News at Ten programs that were broadcast during Britain's year-long miners' strike--March 1984-March 1985--and a four-month sample of Channel 4 news to examine how television news covered a protracted story of…