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Independent Selection is a selection strategy whereby a genotype is selected if it has an outstanding level for a single trait (breeding objective), regardless of its levels on other traits. This strategy guarantees that a genotype that might be a donor for some trait will not be discarded for its defects on other traits.
In the multi-trait selection tool of GGEbiplot, Independent Selection on a trait is conducted by considering three pieces of specifications by the researcher:
1. Selection rate (0 to 50%),
2. Weight (relative importance, [-1, +1]) of the trait, and
3. Action direction of the trait (the sign of the weight).
If the Selection Rate is 30%, and the weight of the trait is 0.5, then genotypes with a value of 0.85 (=1 - 0.3 * 0.5) or higher for the trait will be selected. If the culling rate is 30%, and the weight is -0.6, then genotypes of a value of 0.18 (= 0.3 * 0.6) or lower will be selected.