Gender Discrimination of Flower Buds of Mature Populus tomentosa by HPLC Fingerprint Combined with Chemometrics

Figure 4

OPLS-DA model for the classification of MFB and FFB of P. tomentosa. (a) Score plot of the OPLS-DA model. Boxes refer to MFB of P. tomentosa, and circles refer to FFB of P. tomentosa. The X axis refers to the scores of PCs. The Y axis refers to the scores of orthogonal components. (b) 200 permutation tests of the OPLS-DA model. The X axis represents the correlation between the permuted model and the original model. The Y axis represents R² and Q² of the permuted models. (c) S-plot of the OPLS-DA model. The X axis represents the correlation coefficient between PCs and common compounds. The Y axis represents VIP values.

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