Lin et al. (2020) compared results from seven classifiers (NB, KNN, SVM, C4.5 DT, classification and regression trees (which uses the DT structure), RF, logistic regression) and LDA to differentiate PD-NC (n = 57), PD-MCI (n = 29), and PDD (n = 87) from each other based on Aβ42, beta-amyloid-40 (Aβ40), total-tau, phosphorylated-tau-181 (p-tau-181), and alpha-synuclein levels in plasma. This evidence concerns the gene SNCA and Parkinson disease.