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by a-dub
1639 days ago
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i find the simplest way to explain pca to a general audience is to draw a ellipse of points off center and tilted in 3d space, and then draw plots for x, y and z. then center the ellipse and rotate the axes to match the major and minor axes of the ellipse and then show how it can be drawn in just x and y and that those x and y plots are far easier to interpret. done. |
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