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. 2022 Apr 7;22(8):2835. doi: 10.3390/s22082835

Figure 3.

Figure 3

Linearity plots with R2 and intercept values for all unseen data. (a) PCA–RF; (b) PCA–SVR; (c) PLS (n = 4); (d) PCR (n = 5). The black points relate to the internal validation set and the red points relate to the external test set.