Explaining PCA to a school child

Ed Yong asked on Twitter “Explain principal component analysis to a schoolchild in a tweet.” Since I can’t explain PCA eloquently, I found this interesting and wanted to keep a record of the replies for future reference. Here are some of the modified replies, with my favourite first (and the rest in no particular order):...

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Step by step Principal Component Analysis using R

I've always wondered what goes on behind the scenes of a Principal Component Analysis (PCA). I found this extremely useful tutorial that explains the key concepts of PCA and shows the step by step calculations. Here, I use R to perform each step of a PCA as per the tutorial. Our dataset visualised on the...

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