It is common to include multiple dependent variables (DVs) in single-case experimental design (SCED) meta-analyses. However, statistical issues associated with multiple DVs in the multilevel modeling approach (i.e., possible dependency of error, heterogeneous treatment effects, and heterogeneous error structures) have not been fully investigated.…

Purpose: This study provides cross-country evidence regarding the extent to which distributed leadership operates in schools globally and offers preliminary insights about country education policies that explain the reported distributed leadership results. The researchers also investigate the relationship between principals' reports of distributed…

The influence of students' non-cognitive characteristics on their learning performance constitutes a significant but rather unexplored topic. The goal of the research presented in this article, is to examine the relation between the students' personality characteristics (as measured using the Big Five Personality Test) and their learning outcome…

Purpose: This paper aims to explore why harmonisation, given its potential, is so difficult to achieve. It analyses the issues and challenges in achieving harmonisation of training and development across an industry. Design/methodology/approach: The approach was a meta-analysis of six research projects undertaken in the Australian rail industry.…

Extant research on parental involvement in education has been conducted largely without respect to which parent is involved. The implicit assumption is that family-school relationship frameworks function similarly for fathers and mothers. Although there is a growing body of research examining fathers' involvement in education, this assumption has…

Purpose: This article illustrates how successful leaders combine the too often dichotomized practices of transformational and instructional leadership in different ways across different phases of their schools' development in order to progressively shape and "layer" the improvement culture in improving students' outcomes. Research…

Over the past 20 years, there has been much research on how people learn from case comparisons. This work has implemented comparison activities in a variety of different ways across a wide range of laboratory and classroom contexts. In an effort to assess the overall effectiveness of case comparisons across this diversity of implementation and…

The purpose of this project is to demonstrate the practical methods developed to utilize a dataset consisting of both multivariate and multilevel effect size data. The context for this project is a large-scale meta-analytic review of the predictors of academic achievement. This project is guided by three primary research questions: (1) How do we…

Although the relationship between motivation (especially intrinsic motivation) and creativity (especially as a product), no meta-analyses have been conducted on the relationship between these 2 concepts. This study aimed to analyze the relationship between intrinsic motivation and creativity related to product (i.e., creative outcomes) through…

Objective: To determine whether peripheral biochemical markers (biomarkers) might differentiate patients with attention-deficit/hyperactivity disorder (ADHD) from non-ADHD individuals. Method: We conducted a systematic search and a series of meta-analyses of case-control studies comprising studies from 1969 to 2011. Results: We identified 210…

This article takes a further look at the percentage of data points exceeding the median (PEM) analysis method for single-case research data, first presented in this journal by Hsen-Hsing Ma. Ma examined the relationship between PEM and the established percentage of nonoverlapping data (PND) and then applied PEM in a meta-analysis of 61 data sets,…

An obstacle to broader acceptability of effect sizes in single case research is their lack of intuitive and useful interpretations. Interpreting Cohen's d as "standard deviation units difference" and R[superscript 2] as "percent of variance accounted for" do not resound with most visual analysts. In fact, the only comparative analysis widely…

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…

Background: Previous empirical studies of the cognitive sequelae of failure to thrive in infancy have led to apparently inconsistent conclusions. Methods: Studies of cognitive abilities in failure to thrive were located through published bibliographies, supplemented by a search through MEDLINE. They were classified (a) into those in which the…