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Do we need to transform data before implement PCA to the raw data? Or it just acceptable if we proceed to used PCA to the raw data?

bbadyalina
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    Have you already searched this site? This isn't the kind of question that has a general answer and you haven't provided sufficient details. This might be helpful: http://stats.stackexchange.com/questions/53/pca-on-correlation-or-covariance – HStamper Jan 14 '17 at 03:21
  • Or search on Google for "stackexchange pca transform". – rolando2 Jan 14 '17 at 15:20
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    I vote to close as unclear because this is impossible to answer in such a generality. – amoeba Jan 17 '17 at 11:50

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