pca function automatically mean-centers

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Mari
Mari 2014-7-3
回答： Shashank Prasanna 2014-7-3
Hi
It looks as if the pca function automatically mean-centers the data. Is this the case and if so how can I override this? I want to center my data using the median or group means.
Thanks Marì

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回答（1 个）

Shashank Prasanna
You are right, by default PCA centers the data. You can however ask PCA not to do that:
http://www.mathworks.com/help/stats/pca.html#namevaluepairarguments
Set the name value pair, 'Centered' to false.

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