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A meta-analysis is a statistical technique that combines the result of several studies in order to test a research hypothesis.

A '''meta-analysis''' is a statistical technique that combines the result of several studies in order to test a research hypothesis.

There are several weaknesses to this approach.  Sources of bias cannot be controlled by a meta-analysis. In addition, a bias towards a predetermined outcome can influence the choice of studies to combine in the meta-analysis.

There are possible weaknesses to this approach:

* It is harder to control sources of bias since multiple studies are involved.

* A bias towards a predetermined outcome can influence the choice of studies to combine.

[[category:statistics]]

[[category:Probability and Statistics]]