A funnel plot is a useful graph designed to check the existence of publication bias in systematic reviews and meta-analyses. It assumes that the largest studies will be near the average, and small studies will be spread on both sides of the average. Variation from this assumption can indicate publication bias.
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“The westward march has stopped, upon the final plains of the Pacific; and now the plot thickens ... with the change, the pause, the settlement, our people draw into closer groups, stand face to face, to know each other and be known.”
—Woodrow Wilson (1856–1924)