Galbraith plot

Galbraith plot

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. [cite journal |last= Galbraith |first= Rex|year= 1988 |title= Graphical display of estimates having differing standard errors|journal=Technometrics
volume=30 |issue=3 |pages=271--281 |url=http://links.jstor.org/sici?sici=0040-1706%28198808%2930%3A3%3C271%3AGDOEHD%3E2.0.CO%3B2-8 |doi= 10.2307/1270081
] It can be used to examine heterogeneity in a meta-analysis, as an alternative or supplement to a forest plot. To produce a Galbraith plot, first calculate 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 small SE and larger 1/SE) aggregate away from the origin. [http://www-users.york.ac.uk/~mb55/msc/systrev/het_text.pdf]

See also

* Funnel plot

References


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