Discrimination vs. representativeness of testers
From Biplot Analysis, click Discrimination vs. representativeness. The following will appear on the biplot:
- The vectors for the testers;
- A small red circle indicating the position of the average tester, which is defined by the average PC1 and PC2 scores across all environments. This average environment can be regarded as a virtual environment;
- a thick red line that passes through the biplot origin and the average environment, referred to as the average-tester axis;
- a red arrow pointing to the average environment from the biplot origin;
- The vector length of a tester represents its discriminating ability. Thus testers 5 and 7 are the most discriminating testers.
- The angle between a tester and the average-tester axis represents the representativeness of the tester: the larger the angle, the less representative the tester. Thus testers 3 is most representative whereas tester 7 the least representative.
- An ideal tester should be both discriminating of the entries and representative of the average tester. See Rank testers relative to the ideal tester..
This function applies only to GGE biplots with certain data scaling methods. Particularly, GGE biplot based on Standard Deviation scaled data does NOT have this interpretation.