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What is a GGE biplot
The term "GGE biplot" first appeared in Yan et al. (2000). It refers to a biplot that displays the G and GE of a genotype-by-environment data. The key property of a GGE biplot is that it is based on Tester-Centered data, whereby the tester (environment) main effects (E) are removed, and the entry main effect (G) and the entry by tester interaction (GE) are retained and combined. Therefore, a biplot based on tester-centered data contains only G+GE, shortened as GGE.
The GGE biplot methodology was developed for graphical analysis of genotype by environment data or multi-environment trials (MET) data. However, it is a rather generic method that can be applied to many other types of two-way dada. GGE biplot is the most commonly used and most useful type of biplot. The term "biplot" in this document refers to GGE biplot unless it is explicitly specified.
Read More: Other types of biplots.