REDUNDANCY ANALYSIS (RDA)

Redundancy Analysis (RDA) has been developed by Van den Wollenberg (1977) as an alternative to Canonical Correlation Analysis (CCorA). RDA allows studying the relationship between two tables of variables Y and X. While the CCorA is a symmetric method, RDA is non-symmetric. In CCorA, the components extracted from both tables are such that their correlation is maximized. In RDA, the components extracted from X are such that they are as much as possible correlated with the variables of Y. Then, the components of Y are extracted so that they are as much as possible correlated with the components extracted from X.