Describe meta-analysis, Advanced Statistics

Meta-analysis is the collection of techniques whereby the results of two or more independent studies are statistically combined to yield the overall answer to a question of interest. The rationale at the back this approach is to give a test with more power than is given by the separate studies themselves. This procedure has become increasingly popular in last decade or so but it is not without its critics particularly because of difficulties of knowing which studies should be included and to which the population final results actually apply.

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