Dear Dr. Salam
Meta analysis is one of the research methods that based on the findings of previous research. There are many books and articles about this topic.
Dear Salam,
Meta-analysis is the statistical procedure for combining data from multiple studies. We can perform this study on vast variety of subject and studies and nobody can limit Meta-analysis to a specific subject. However, we like to perform this study when adequate paper are available and more importantly we we are interested in finalize and make a unique result, for example the Prevalence or Incidence and so on. This studies are very important for health planing and finding better treatment, intervention and prevention programs.
Moreover, Meta-analysis is a quantitative, formal, epidemiological study design used to systematically assess the results of previous research to derive conclusions about that body of research. Typically, but not necessarily, the study is based on randomized, controlled clinical trials. Outcomes from a meta-analysis may include a more precise estimate of the effect of treatment or risk factor for disease, or other outcomes, than any individual study contributing to the pooled analysis.
(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3049418/)
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