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Abstract
A recently proposed framework for analytical figures of merit for nth-order data is discussed. A simple proof is provided that shows that for calculation of these performance characteristics the data is unfolded to a vector (1st-order data). In doing so the special structure of the data is not respected, which may lead to inconsistencies. The practical and theoretical implications of this observation are outlined. Theoretical ideas are illustrated with respect to a recently published application of excitation-emission fluorescence spectroscopy.