Proposes a new method, reliability generalization, for meta-analysis. Reliability generalization characterizes the typical reliability of scores for a test across studies, the amount of variability in reliability coefficients, and the sources of this variability. Analysis of 87 reliability coefficients for two scales of the Bem Sex Role Inventory…

Describes the early stages of development of the Campbell Collaboration Social, Psychological, Educational & Criminological Trials Register (C2-SPECTR) to help those preparing and maintaining systematic reviews of experiments in these fields. The register currently contains more than 10,000 records, including more than 300 references to existing…

Looks at criticisms of public administration research: (1) knowledge in the field is not being accumulated, and (2) the research has low quality. Proposes meta-analysis as a solution to the first problem. Suggests that quality judgments should be based on knowledge cumulation, which acknowledges the value of all research methods. (Contains 48…

Suggests that replication research and meta-analysis are not substitutes for statistical significance testing, but rather, like measures of effect size, they are complements to statistical significance testing. Significance testing does provide a means for determining what might be usefully replicated. (SLD)

Reviewed the literature on interventions to promote self-determination for individuals with disabilities and performed a meta-analysis of 22 studies to investigate the nature and outcomes of such interventions. Discusses results with regard to the idea that self-determination can be taught and learned. (SLD)

Replies to commentary by J. Cameron asserting that the negative results of extrinsic reward on intrinsic motivation are limited and avoidable. Suggests that the most recent meta analysis by Cameron and others shares methodological weaknesses with an earlier analysis, lacking ecological validity. (SLD)

Studied the effect of including nonindependent correlations in the meta-analysis method of J. Hunter and F. Schmidt on the estimated population standard deviation. Evaluation indicates that the Hunter and Schmidt method will underestimate the true population standard deviation. Developed new methods to correct for this and illustrated the methods…

Describes meta-analysis, including criticisms; reviews its use in resolving disagreements regarding the results of research in psychotherapy, school funding, and medicine. (Contains 43 references.) (PKP)

Discusses four reasons for promoting the use of confidence intervals: (1) ease of interpretation; (2) links with familiar statistical tests; (3) promotion of meta-analytic thinking; and (4) increase of information about precision. Discusses calculations of confidence intervals for a basic standardized effect size measure and discusses software for…

The relationship of post-secondary correctional education (PSCE) and recidivism has been widely studied with various, idiosyncratic results. A meta-analysis of ten years of existing studies was conducted to synthesize a portion of the past research. This study demonstrates, using relevant studies reported from 1990 - 1999, that there is a positive…

Although feedback is an important component of computer-based instruction (CBI), the effects of feedback on higher-order learning outcomes are not well understood. Several meta-analyses provide two rules of thumb: any feedback is better than no feedback and feedback with more information is better than feedback with less information. …

Linkage studies of complex phenotypes such as reading ability/disability (developmental dyslexia or reading disorder) and related componential processes, where the effects attributable to individual genes appear to be modest, are critically dependent on the nature and composition of the samples and the phenotypes analyzed. Thus, it might be…

Blanton and Jaccard questioned the 4-test regression method used by Greenwald et al. to test a pure multiplicative theory. The present authors address Blanton and Jaccard's concerns with a combination of simulations and meta-analysis. Simulations show that (a) Blanton and Jaccard's preferred simultaneous regression method has a severe power loss…

The vertical dimension of interpersonal relations (relating to dominance, power, and status) was examined in association with nonverbal behaviors that included facial behavior, gaze, interpersonal distance, body movement, touch, vocal behaviors, posed encoding skill, and others. Results were separately summarized for people's beliefs (perceptions)…

Researchers are becoming interested in combining meta-analytic techniques and structural equation modeling to test theoretical models from a pool of studies. Most existing procedures are based on the assumption that all correlation matrices are homogeneous. Few studies have addressed what the next step should be when studies being analyzed are…