Orthogonal projections to latent structures discriminant analysis (OPLS-DA). (A) OPLS-DA score diagram. The x-axis (t1) represents the prediction component (inter-group difference component), and the y-axis (to1) represents the orthogonal component (intra-group difference component). (B) OPLS-DA model replacement test diagram. The x-axis represents the correlation between the permutation group and the original model group, the y-axis represents the value of R2Y or Q2Y (where R2Y and Q2Y of 1 in the x-axis are the values of the original model), and the two dashed lines are the regression lines fitted by R2Y and Q2Y.
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