By Mark W. Lipsey
What learn designs and methodological positive factors qualify a research for meta-analysis and which disqualify it? What forms of learn experiences are applicable for the meta-analysis? what's the cultural and linguistic variety of the reviews to be incorporated? by way of integrating and translating the present methodological and statistical paintings right into a sensible consultant, the authors tackle those inquiries to offer readers with a cutting-edge advent to some of the ways to doing meta-analysis.
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Extra info for Practical Meta-Analysis
Additional computer databases and access information are provided in Appendix A. Searches of this type are possible through telnetbased search tools, such as those available from Dialog Corporation or Ovid Technologies, although these services can be costly for individual researchers. Thus, a comprehensive search will generally require multiple databases. If not, the descriptors associated with the most relevant Page 27 items that emerge from a preliminary computer search should be used in a refined search.
In other cases, the nonuniversity metaanalyst may be able to collaborate with a university researcher and gain access to an academic library in that way. While a university library is the central resource for obtaining copies of study reports for metaanalysis, there are other avenues that must generally be used as well. The reference desk of most university libraries will have the UMI order forms, along with the order forms for ERIC and other document depositories. ). The vast resources of the Government Printing Office should not be overlooked either (Appendix A identifies computerized databases that index the GPO publications).
First, however, it is instructive to examine the nature of effect size statistics and the information that must be obtained to compute and use them. They yield no information about the overall magnitude of effect or the consistency of effects across studies (Becker, 1994; Rosenthal, 1991). The metaanalyst may be interested in all these different findings or only some designated subset of them. Formulas and procedures for estimating effect size values from quantitative information that is incomplete or presented in forms different from that required for direct computation are a necessary and important part of effect size coding in metaanalysis.
Practical Meta-Analysis by Mark W. Lipsey