Why should the person deciding which studies to include in a meta-analysis be to

Question

Why should the person deciding which studies to include in a meta-analysis be told how each study was conducted but not the results of the study? The person deciding which studies should include should know the results of the study so they can choose the ones that will do the best job of supporting their own viewpoint. Studies should be included or excluded on the basis of quality and methodology, not on the basis of the results. Knowing the results might bias the selection; the temptation might be to include only successful ones. Meta-analysis should only be done on studies that are incomplete. If a study already has results in, it must be completed and so it would be inappropriate to include it in a meta-analysis. The "meta" in "meta-analysis" is Greek for "how", so meta-analysis is only about how a study is run.

Explanation / Answer

If the results of the study is known in advance, it brings in personal bias into the data which gives false results.

So here, the result is option 2

Studies should be included or excluded on the basis of quality and methodology, not on the basis of results. Knowing the results may bias the selection, the temptation might be to include other successful ones.

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