"A further statistic, SDR, was also used and defined as:
SDR = SD/RMSEP
where SD was the data set standard deviation. In theory (for large normally distributed data set) it is equal to, and indicates more directly than either R2 and RMSEP separately can, the relative predictive performance of a model: the higher the value, the greater the power. We consider a value of three the minimum for sorting/grading purposes, enabling the data set to be split into three groups (of width equivalent to RMSEP) with the extreme two groups not overlapping appreciably. A value of two would mean two groups but with much larger error overlap"
(McGlone, V.A. and Kawano, S., (1998) Firmness, dry-matter and soluble-solids assessment of postharvest kiwifruit by NIR spectroscopy, Postharvest Biology and Technology, 13, 131-141.)
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