Fig. 1

Illustration of data structured by groups of variables and sets of observations. Variables and observations are assumed to be ordered by resp. groups of variables and observations sets. The notation p represents the number of variables of matrix X, q the number of variables of matrix Y, n is the number of observations. \(n_1, \cdots , n_M\) are the resp. number of observations of each observation set. \(p_1, \cdots , p_K\) are the resp. number of variables in each group of variables