Journal ArticleDOI
The Relative Benefits of Meta-Analysis Conducted With Individual Participant Data Versus Aggregated Data
Harris Cooper,Erika A. Patall +1 more
TLDR
The authors describe the relative benefits of conducting meta-analyses with (a) individual participant data (IPD) gathered from the constituent studies and (b) aggregated data (AD), or the group-level statistics that appear in reports of a study's results.Abstract:
The authors describe the relative benefits of conducting meta-analyses with (a) individual participant data (IPD) gathered from the constituent studies and (b) aggregated data (AD), or the group-level statistics (in particular, effect sizes) that appear in reports of a study's results. Given that both IPD and AD are equally available, meta-analysis of IPD is superior to meta-analysis of AD. IPD meta-analysis permits synthesists to perform subgroup analyses not conducted by the original collectors of the data, to check the data and analyses in the original studies, to add new information to the data sets, and to use different statistical methods. However, the cost of IPD meta-analysis and the lack of available IPD data sets suggest that the best strategy currently available is to use both approaches in a complementary fashion such that the first step in conducting an IPD meta-analysis would be to conduct an AD meta-analysis. Regardless of whether a meta-analysis is conducted with IPD or AD, synthesists must remain vigilant in how they interpret their results. They must avoid ecological fallacies, Simpson's paradox, and interpretation of synthesis-generated evidence as supporting causal inferences.read more
Citations
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Journal ArticleDOI
The New Statistics Why and How
TL;DR: An eight-step new-statistics strategy for research with integrity is described, which starts with formulation of research questions in estimation terms, has no place for NHST, and is aimed at building a cumulative quantitative discipline.
Journal ArticleDOI
How do mindfulness-based cognitive therapy and mindfulness-based stress reduction improve mental health and wellbeing? A systematic review and meta-analysis of mediation studies
TL;DR: This review identified strong, consistentevidence for cognitive and emotional reactivity, moderate and consistent evidence for mindfulness, rumination, and worry, and preliminary but insufficient evidence for self-compassion and psychological flexibility as mechanisms underlying MBIs.
Journal ArticleDOI
Integrative data analysis: the simultaneous analysis of multiple data sets.
TL;DR: An overview of IDA as it may be applied within the psychological sciences is presented, the relative advantages and disadvantages of IDa are discussed, analytic strategies for analyzing pooled individual data are described, and recommendations for the use ofIDA in practice are offered.
Journal ArticleDOI
A meta-analytic review of the Motivated Strategies for Learning Questionnaire
Marcus Credé,L. Alison Phillips +1 more
TL;DR: A meta-analytic review of the Motivated Strategies for Learning Questionnaire (MSLQ) is presented in this paper, which consists of fifteen subscales designed from classic social-cognitive learning theories and which is widely used to predict academic performance.
Journal ArticleDOI
Declines in efficacy of anti-bullying programs among older adolescents: Theory and a three-level meta-analysis
TL;DR: In this paper, a meta-analysis of studies that administered the same program to multiple age groups and measured levels of bullying (k = 19, with 72 effect sizes) was conducted by conducting a hierarchical metaanalysis of the within-study moderation of efficacy by age.
References
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Journal ArticleDOI
Fixed- and random-effects models in meta-analysis.
Larry V. Hedges,Jack L. Vevea +1 more
TL;DR: In this paper, the authors evaluate the performance of confidence intervals and hypothesis tests when each type of statistical procedure is used for each kind of inference and confirm that each procedure is best for making the kind of inferences for which it was designed.
Journal ArticleDOI
Meta-Analysis of Psychotherapy Outcome Studies
Mary Lee Smith,Gene V. Glass +1 more
TL;DR: Results of nearly 400 controlled evalua- tions of psychotherapy and counseling were coded and integrated statistically and provide convincing evidence of the efficacy of psych therapy.
BookDOI
Publication Bias in Meta-Analysis: Prevention, Assessment and Adjustments
TL;DR: This work states that within Conventional Publication Bias: Other Determinants of Data Suppression (Scott D. Halpern and Jesse A. Berlin), differentiating Biases from Genuine Heterogeneity: Distinguishing Artifactual from Substantive Effects (John P.A. Ioannidis).