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Scatter plot of the predicted%HDRS with respect to the true%HDRS using PF, NF and PF&NF. Spearman`s correlation of r = 0.27 (p = 2.30 × 10−3), r = 0.51 (p = 6.20 × 10−10) and r = 0.46 (p = 7.84 × 10−8) were achieved for three combinations of features, respectively.
