Ten quick tips for effective dimensionality reduction
Fig 2
Two simulated Gaussian clusters projected on the first and the second PCs. Incorrect aspect ratio in a rectangular (a) and square (b) plot. Correct aspect ratio in (c, d) where the plot's height and width are adjusted to match the variances in PC1 and PC2 coordinates. Colors shown in (d) indicate the true Gaussian group membership. Dim1, dimension 1; Dim2, dimension 2; PC, principal component; PCA, PC analysis.