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Principal component analysis-quadratic discriminant analysis (PCA-QDA) of the SERS spectra of serum. (A) The prediction plot of the PCA-QDA based on the SERS profiling of serum from 53 patients with gastric and colorectal cancer (GCRC) and 25 control subjects (Ctrl) using the first seven principal components as input. (B) The confusion matrix yielded by the PCA-QDA of the SERS spectra of serum.
