I am learning about PCA, regarding PCA I need to know that given a dataset is it always necessary to use centering? what if I don't center the variables used in PCA?
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see the answer here – user603 Feb 19 '14 at 12:17
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Also of possible interest http://stats.stackexchange.com/a/22331/3277 – ttnphns Feb 19 '14 at 16:41