A random-effects model is often applied in meta-analysis when considerable heterogeneity among studies is observed due to the differences in patient characteristics, timeframe, treatment regimens, and other study characteristics. Since 2014, the journals "Research Synthesis Methods" and the "Annals of Internal Medicine" have…

This meta-analytic review demonstrates that language interventions can improve oral language in children with neurodevelopmental disorders. We assessed interventions that target language skills in children with neurodevelopmental disorders. The interventions had to use techniques ranging from explicit and structured activities (explicit…

Primarily focused on answering questions why and how, this qualitative research relates to human being and behavior and could bring understanding of socially constructed phenomena, including people's needs, experiences, behavior, motives, desires and expectations. Meta-synthesis is an important method that provides valuable insights into the…

In 2016, more than 1.6 million students took the Scholastic Aptitude Test (SAT), a standardized college admissions test (College Board 2016a). Researchers have estimated that 33 percent of students who take the SAT participate in some mode of formal test preparation, such as private tutoring or classes, to prepare for the exam (Buchmann, Condron…

Bullying is a pervasive problem that impacts children and youth in schools involved as perpetrators, victims, and bystanders. This paper synthesizes findings from the empirical literature, including meta-analyses, to examine the evidence for bullying prevention and intervention approaches with attention to developmental levels (preschool,…

Serious games have become increasingly available to educators. Empirical studies and meta-analyses have examined their impact on learning achievement. However, natural sciences could have a special relation to serious games by their systematic use of quantitative and predictive models that can generate microworlds and simulations. Since no known…

Twenty-nine peer-reviewed journal articles that analyzed intervention implementation in schools using single-case experimental designs were meta-analyzed. These studies reported 171 separate data paths and provided 3,991 data points. The meta-analysis was accomplished by fitting data extracted from graphs in mixed linear growth models. This…

Meaningful and effective training and professional development programs for teachers are key to the improvement of teaching practices in our schools. In this paper, the authors offer a meta-synthesis of the literature on the role of reflection for mathematics and science teachers within the context of professional development. The authors frame…

This occasional paper introduces the methods of research synthesis and meta-analysis to researchers and consumers of research in the field of adult learning and literacy. To begin, the first section of the paper defines key terms and offers a brief history of how the methodologies developed. The second section provides a conceptualization of…

The purpose of this paper is to summarize the research on service learning pedagogy into the realm of professional practice for students with disabilities. At this point in the development of a research base for service learning, an emerging need for studies is reported. Limited research exists which studies the impact of service learning…

This article discusses the limitations of 14 randomized controlled trials of exercise rehabilitation for patients who sustained myocardial infarction. The difficulty of sampling patients and controlling the sample size is discussed and the benefits of pooled statistical evidence are considered. (JL)

Solutions to methodological problems in medical technologies research synthesis relating to temporal change, persons receiving treatment, research design, analytic procedures, and threats to validity are presented. These solutions should help with the planning and methodogy for research synthesis in other areas. (BS)

In 1998, Horvath et al. [Horvath, K., Stefanatos, G., Sokolski, K. N., Wachtel, R., Nabors, L., & Tildon, J. T. (1998). Improved social and language skills after secretin administration in patients with autism spectrum disorders. "Journal of the Association of the Academy of Minority Physicians," 9, 9-15] reported an uncontrolled…

Ernst Mach is most closely associated with a positivism that demanded a language of close contact with reality. Mach linked this view with the tradition of the quest for an ideal language in which meaning is a property of a word. Logical positivism and the S-R psychology of the early B. F. Skinner also participated in this ideal-language…

Meta analytic procedures recommended by various authorities were the subject of a literature review designed not to discuss the relative merits of contrasting recommendations, but to find what is actually in the literature. The sample reviewed included 89 articles published between 1986 and 1992, from 2 journals and 2 information databases. Meta…