Could someone explain what is, from a mathematical practical point of view, PCA in data analysis and when to use it briefly ? and also when to use Eigenvalue decomposition VS Singular value decomposition ?
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1You are asking two unrelated questions; it would be best if you asked them in two separate posts – Ben Grossmann Jan 24 '21 at 21:51
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Regarding PCA, I strongly recommend you look at this post on Cross Validated. – Ben Grossmann Jan 24 '21 at 21:53
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The first one i said just briefly the question is more about the SVD EVD comparison – ites Jan 24 '21 at 21:58
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For that question, see this post – Ben Grossmann Jan 24 '21 at 22:41
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If the post I linked does not give you a satisfactory answer, then it would be helpful if you could edit your post to explain what specific questions about EVD and SVD you have that aren't answered by the post I linked. – Ben Grossmann Jan 24 '21 at 22:43