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[[File:Funnelplot.png|thumb|right|An example funnel plot showing no publication bias. Each dot represents a study (e.g. measuring the effect of a certain drug); the ''y''-axis represents the size of the study (e.g. number of experimental subjects) and the ''x''-axis shows the study's result (e.g. the drug's measured average effect).]]
A '''funnel plot''' is a graph used designed to check for the existence of [[publication bias]]; funnel plots are commonly used in [[systematic review]]s and [[meta-analysis|meta-analyses]]. In the absence of publication bias, it assumes that the largest studies will be plotted near the average, and smaller studies will be spread evenly on both sides of the average, creating a roughly [[funnel]]-shaped distribution. Deviation from this shape can indicate publication bias.
== Quotation ==
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