GGE: GGE analysis for multienvironment genotype experiments
Description
This function performs the GGE (Genotype plus Genotype by Environment interaction) analysis, according to Yan et al., 2000.
Usage
GGE(yield, genotype, environment, block, PC = 2)
Value
Returns a list of class 'GGEobject' with the following components
genotype_means
The overall least squares genotype means
environment_means
The overall least squares environment means
interaction_means
The least squares means for the genotype by environment combinations
ge_effect
a two-way table of 'interaction effects'gge' effects
additive_ANOVA
an ANOVA table for the additive model
GGE_summary
a summary table for GGE analysis
environment_scores
a table of environment scores
genotype_scores
a table of genotype scores
Arguments
yield
a vector containing yield levels
genotype
a vector containing genotype codings
environment
a vector containing environment codings
block
a vector containing block codes for each environment
PC
the number of PCs that one wants to extract
Author
Andrea Onofri
References
Yan, W., Hunt, L.A., Sheng, Q., Szlavnics, Z., 2000. Cultivar Evaluation and Mega-Environment Investigation Based on the GGE Biplot. Crop Science 40, 597–605.