In statistics, study heterogeneity is a problem that can arise when attempting to undertake a meta-analysis. Ideally, the studies whose results are being combined in the meta-analysis should all be undertaken in the same way and to the same experimental protocols: study heterogeneity is a term used to indicate that this ideal is not fully met.
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“Let us, therefore, study the incidents of this [war], as philosophy to learn wisdom from, and none of them as wrongs to be revenged.”
—Abraham Lincoln (1809–1865)