Galbraith plot

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Statistical device

title: "Galbraith plot" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["statistical-charts-and-diagrams", "meta-analysis"] description: "Statistical device" topic_path: "general/statistical-charts-and-diagrams" source: "https://en.wikipedia.org/wiki/Galbraith_plot" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Statistical device ::

In statistics, a Galbraith plot (also known as Galbraith's radial plot or just radial plot) is one way of displaying several estimates of the same quantity that have different standard errors. |volume=30 |issue=3 |pages=271–281 |doi= 10.2307/1270081 |publisher= Technometrics, Vol. 30, No. 3 |jstor=1270081}} ::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/68/Example_Galbraith's_radial_plot.svg" caption="Example for Galbraith's radial plot (A) and a variant of it, the Abanico plot (B) ."] ::

It can be used to examine heterogeneity in a meta-analysis, as an alternative or supplement to a forest plot.

A Galbraith plot is produced by first calculating the standardized estimates or z-statistics by dividing each estimate by its standard error (SE). The Galbraith plot is then a scatter plot of each z-statistic (vertical axis) against 1/SE (horizontal axis). Larger studies (with smaller SE and larger 1/SE) will be observed to aggregate away from the origin.

References

[http://www-users.york.ac.uk/~mb55/msc/systrev/week7/het_text.pdf University of York, Department of Health sciences MSc course material]

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