scatter plot Galbraith plot Galbraith (Radial) plot is a scatter plot which can be used in the meta-analytic context to examine the data for heterogeneity. For a fixed-effects model, the plot shows the inverse of the standard errors on the horizontal axis against the individual observed effect sizes or outcomes standardized by their corresponding standard errors on the vertical axis. Radial plots were introduced by Rex Galbraith (1988a, 1988b, 1994).