Problem 2043. Six Steps to PCA - Step 1: Centre and Standardize
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Jean-Marie Sainthillier
on 10 Feb 2014
Your definition of a constant (or invariant) data with rand is problematic. If you increase the size of your data (n=1000, n=10000...), you can always increase the deviations (so what threshold for sigma ?). I think that with real data, this artifact isn't possible. No ?
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