The AMMI analysis and graphing the biplot

With the objective of facilitating researchers of CIMMYT and National Programs to compute the AMMI model and the biplot of multi-environment trials, three programs were written in SAS for computing the AMMI analysis and using the Gollob test (Gollob, 1967) for determining the significant number of multiplicative terms. For each of these programs the graphic of the biplot is obtained.