Fig. 5. Response of (top) sensitivity and (bottom) specificity to size of training data set in spectral screening tests for high N (<25 mg kg^-1), low lignin (<110 mg kg^-1), and low total soluble polyphenol (<40 mg kg^-1) concentrations. The results are for the proportion of the total data set (n = 319) not used for training. Sensitivity is the percentage of abnormal cases correctly classified, and specificity is the percentage of abnormal cases correctly classified.

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