The key matrix is used to specify any number of weighted item composites. A correlation matrix of these composites and the original correlation matrix is then computed and returned.
A correlation matrix.
A matrix with one row for each composite and one column for each item contained in r_mat. The value if each element corresponds to the weight given to an item.
A matrix of intercorrelations.
Allen Goebl and Jeff Jones
 "example needed"
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