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…

This review provides a synthesis of the scholarship that has sought to expand the understanding of educational marketing practice in schools. The following research questions guided this review. What are the common themes and characteristics that emerge from research about marketing in schools? What remains underdeveloped in the characterization…

A large literature has developed in which labor market contracts are used to estimate the value of a statistical life (VSL). Reported estimates of the VSL vary substantially, from less than $100,000 to more than $25 million. This research uses meta-analysis to quantitatively assess the VSL literature. Results from existing studies are pooled to…

The authors performed a meta-analysis of the distributed practice effect to illuminate the effects of temporal variables that have been neglected in previous reviews. This review found 839 assessments of distributed practice in 317 experiments located in 184 articles. Effects of spacing (consecutive massed presentations vs. spaced learning…

Using computer simulation, the authors assessed the accuracy of J. E. Hunter, F. L. Schmidt, and H. Le's (2006) procedure for correcting for indirect range restriction, the most common type of range restriction, in comparison with the conventional practice of applying the Thorndike Case II correction for direct range restriction. Hunter et…

The objective of this report is to review studies that report language and literacy outcomes associated with preschool curriculum-based interventions. Results from studies reporting on interventions targeting preschool children from low-income families were included regardless of the specific type of program. Although the majority of preschool…