Meta-analysis techniques

The three elements of meta-analysis include exact specification of sources from which primary studies are identified; transformation of primary study findings to a common metric; and statistical analysis of primary study findings. Meta-analysis has several drawbacks, such as dependence on the quality of the reporting of primary analysis findings; dependence on sufficient numbers of eligible studies to justify statistical analysis; a lack of a universal common metric; and a lack of expert agreement about the best form of statistical analysis. As researchers become more familiar with meta-analysis, two effects will be seen: an increased use of meta-analysis elements in all review of literature, and increased attention to reporting important details of research in scientific journals.