Download Advances in Meta-Analysis by Terri D. Pigott (auth.) PDF

By Terri D. Pigott (auth.)

The topic of the ebook is complicated statistical analyses for quantitative study synthesis (meta-analysis), and chosen useful concerns on the subject of learn synthesis that aren't lined intimately within the many latest introductory books on study synthesis (or meta-analysis). complicated statistical concerns are coming up extra usually because the basic study that's summarized in quantitative syntheses itself turns into extra complicated, and as researchers who're carrying out meta-analyses turn into extra formidable within the questions they want to deal with. additionally as researchers have received extra adventure in carrying out examine syntheses, a number of key matters have persevered and now seem basic to the company of summarizing research.

Specifically the booklet describes multivariate analyses for a number of indices generic in meta-analysis (e.g., correlations, impression sizes, proportions and/or odds ratios), will define the best way to do energy research for meta-analysis (again for every of different varieties of research final result indices), and examines concerns round study caliber and study layout and their roles in synthesis. for every of the statistical subject matters we'll study the various attainable statistical types (i.e., mounted, random, and combined versions) that may be followed through a researcher. In facing the problems of research caliber and learn layout it covers a couple of particular themes which are of extensive problem to analyze synthesists. in lots of fields a present factor is how you can make experience of effects while experiences utilizing a number of diversified designs seem in a study literature (e.g., Morris & Deshon, 1997, 2002). In schooling and different social sciences a serious element of this factor is how one may include qualitative (e.g., case research) study inside a synthesis. In medication, comparable matters quandary even if and the way to summarize observational experiences, and whether or not they might be mixed with randomized managed trials (or no matter if they need to be mixed at all).

For each one subject, integrated is a labored instance (e.g., for the statistical analyses) and/or a close description of a broadcast learn synthesis that bargains with the sensible (non-statistical) matters lined.

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Advances in Meta-Analysis

The topic of the e-book is complicated statistical analyses for quantitative examine synthesis (meta-analysis), and chosen functional concerns in relation to learn synthesis that aren't lined intimately within the many latest introductory books on study synthesis (or meta-analysis). advanced statistical concerns are coming up extra often because the basic learn that's summarized in quantitative syntheses itself turns into extra advanced, and as researchers who're accomplishing meta-analyses develop into extra formidable within the questions they want to handle.

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6 Conducting a Meta-Regression When a reviewer has a larger sample of studies, conducting a meta-regression can help a reviewer avoid conducting multiple significance tests, and instead examine the conditional relationship among the predictors and effect size magnitude. Introductory text books (Borenstein et al. 2009; Lipsey and Wilson 2000) provide more detail about the background for conducting a meta-regression; here I will provide an example of meta-regression using another subset of the Sirin (2005) data.

Though organizations such as the American Psychological Association (American Psychological Association 2009) are emphasizing the interpretation of effect sizes rather than statistical significance, power computations remain in the realm of the null and alternative hypothesis. In order to compute power, researchers use a value for the alternative hypothesis that represents some substantively important quantity, such as the smallest effect size that would be considered substantively critical, and then discuss the power of a statistical test under the specific alternative hypothesis posed.

The option eqcons fixes the variances for the 11 studies in the analysis since these are considered known in a meta-analysis model. 0030) /EQCONS¼2 to 12; run; Computing the Variance Component Using R Below is a simple iterative program to obtain the restricted maximum likelihood estimates from R. The estimates are described by Raudenbush (2009). The first two lines set up the starting values for the random effects mean and variance, namely a vector of 100 elements, all having the value of zero.

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