Criticizes an article in which S. A. Cohen and J. S. Hyman describe as "suspicious" the high proportion of statistically significant findings reported in published educational research journals and offers alternative explanations for the high statistical power reported. (GC)

A Bayesian solution is presented for the Johnson-Neyman problem (whether or not the distance between two regression lines is statistically significant over a finite interval of the independent variable). (Author/CTM)

A study was conducted using generated data sets that contained specified amounts of error to determine empirically which of two large sample approximations for the coefficient of concordance or weighted average tau was more appropriate for various numbers of judges and numbers of objects. (CTM)

Two commentaries describe some shortcomings of a recent discussion of the significance testing of R-squared by C. J. Huberty and upward bias in the statistic. Both propose some modifications. A response by Huberty acknowledges the importance of the exchange of ideas in the field of data analysis. (SLD)

Identifies the common supposition in research by business educators that a research outcome that is statistically significant is necessarily practically significant. Describes the use and interpretation of a simple objective measure of practical significance, called Effect Size. (Author)

Contends that tests of statistical significance and measures of magnitude in counseling psychology research do not provide same information. Argues interpreting magnitude of experimental effects must be two-stage decision process with the second stage of process being conditioned on results of a test of statistical significance and entailing…

The estimate-and-subtract method for eliminating threats to validity is described. It is argued that the method is superior to the use of no-difference findings for this purpose. Two ways of improving the no-difference findings are presented. (TJH)

Investigates the presence of clustering structure in a document collection and the influence of the presence of clustering structure on the success of cluster-based retrieval. Term-weight and similarity thresholds are discussed, empirical and statistical significance are considered, and indexing exhaustivity for document representation is…

Examined the historical growth in the popularity of statistical significance testing using a random sample of data from 12 American Psychological Association journals. Results replicate and extend findings from a study that used only one such journal. Discusses the role of statistical significance testing and the use of replication and…

The Hubbard and Ryan article is a little ingenuous in its implications for action. Both meta-analyses and replication have problems of their own; each requires careful attention. Good measurement emphasizes proper sampling techniques and using whatever means possible to analyze data. (SLD)

Agrees with R. Hubbard and P. Ryan that statistical significance testing has had a negative impact in that some users have closed their minds to alternative approaches to conducting research. In marketing, the alternatives are not completely satisfactory, however, and researchers are likely to continue to rely on statistical significance testing.…

The purpose of this article was to extend the research pertaining to the idea of a statistically significant exact replication (SSER) method published recently in the Mid-Western Educational Researcher. The current study continues the idea of SSER and provides researchers with a software program that will calculate easily the SSER value when there…

In this study, the reasons why men and women behave differently in leadership roles in schools were investigated because of recent research on the indirect nature of the school principal's impact on learning and on gender differences in leadership behaviors. Practicing principals (109 males, 172 females) from two Southwestern states were surveyed…

This study was designed to examine the impact NCLB defined teacher-quality variables (1) major/minor in mathematics, (2) highest academic degree, (3) type of teaching certificate, (4) years taught mathematics (NCLB, 2001) on the mathematics average scale scores of eighth-grade students. The study used a secondary analysis of the 2007 National…

This report provides a description of the student characteristics, persistence, and degree attainment of a nationally representative sample of students who began postsecondary education for the first time during the 2003-04 academic year. The report describes the background, academic preparation, and experience of these beginning students over 3…