9 links to BETTER understand principal component analysis (PCA):
1. https://divingintogeneticsandgenomics.rbind.io/post/pca-in-action/ PCA in action, my blog post to calculate SVD and PCA with #rstats
2. https://www.youtube.com/watch?v=rYz83XPxiZo MIT 1806 linear algebra on SVD
3. https://peterbloem.nl/blog/pca-4 THE SINGULAR VALUE DECOMPOSITION (SVD)
4. http://rafalab.github.io/pages/harvardx.html High Dimension data analysis, week 2.
5. https://towardsdatascience.com/why-pca-looks-triangular-a642daac721a why PCA looks triangular.
6. https://www.nxn.se/valent/2017/6/12/how-to-read-pca-plots How to read PCA plots for single-cell data.
7. https://twitter.com/AedinCulhane/status/1007110262187544577 PCA horseshoe artifact
8. https://www.youtube.com/watch?v=_UVHneBUBW0 by Josh Starmer
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