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Direct linkLópez-López, José A.; Page, Matthew J.; Lipsey, Mark W.; Higgins, Julian P. T. – Research Synthesis Methods, 2018
Systematic reviews often encounter primary studies that report multiple effect sizes based on data from the same participants. These have the potential to introduce statistical dependency into the meta-analytic data set. In this paper, we provide a tutorial on dealing with effect size multiplicity within studies in the context of meta-analyses of…
Descriptors: Effect Size, Literature Reviews, Meta Analysis, Research Methodology
López-López, José Antonio; Van den Noortgate, Wim; Tanner-Smith, Emily E.; Wilson, Sandra Jo; Lipsey, Mark W. – Research Synthesis Methods, 2017
Dependent effect sizes are ubiquitous in meta-analysis. Using Monte Carlo simulation, we compared the performance of 2 methods for meta-regression with dependent effect sizes--robust variance estimation (RVE) and 3-level modeling--with the standard meta-analytic method for independent effect sizes. We further compared bias-reduced linearization…
Descriptors: Effect Size, Regression (Statistics), Meta Analysis, Comparative Analysis
Wilson, Sandra Jo; Polanin, Joshua R.; Lipsey, Mark W. – Research Synthesis Methods, 2016
A modification of the first stage of the standard procedure for two-stage meta-analytic structural equation modeling for use with large complex datasets is presented. This modification addresses two common problems that arise in such meta-analyses: (a) primary studies that provide multiple measures of the same construct and (b) the correlation…
Descriptors: Meta Analysis, Structural Equation Models, Correlation, Research Methodology
Ntourou, Katerina; Conture, Edward G.; Lipsey, Mark W. – American Journal of Speech-Language Pathology, 2011
Purpose: To identify, integrate, and summarize evidence from empirical studies of the language abilities of children who stutter (CWS) and children who do not stutter (CWNS). Method: Candidate studies were identified through electronic databases, the tables of contents of speech-language journals, and reference lists of relevant articles and…
Descriptors: Stuttering, Children, Meta Analysis, Expressive Language
Download full textWilson, Sandra Jo; Tanner-Smith, Emily E.; Lipsey, Mark W.; Steinka-Fry, Katarzyna; Morrison, Jan – Campbell Collaboration, 2011
The objectives of this systematic review were to summarize the available evidence on the effects of prevention and intervention programs aimed at primary and secondary students for increasing school completion or reducing school dropout. The primary focus of the meta-analysis was to examine the comparative effectiveness of different programs and…
Descriptors: Dropouts, Intervention, Participant Characteristics, Dropout Prevention
Wilson, Sandra Jo; Tanner-Smith, Emily; Lipsey, Mark W. – Society for Research on Educational Effectiveness, 2011
The objective of this systematic review is to summarize the available evidence on the effects of prevention and intervention programs aimed at primary and secondary students for increasing school completion or reducing school dropout. Program effects on the closely related outcomes of school attendance (absences, truancy) will also be examined.…
Descriptors: Learner Engagement, School Restructuring, Intervention, Dropouts
