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Question Over PCA:

1. For a Matrix R*C, There are C number of variable and R number of observation. Have skimmed through alot of threads over this medium as well as other.

Alot of places: It is conveyed that the entries in R (basically our observations) Need to be independent. Why that is the need? I do see the literature or PCA derivation specifically state that! What am I missing here?

2. Why do we need to convert matrix to zero mean and unit variance? what would happen if we don't do the same?

Gau
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  • Your first question is incomprehensible: it seems to describe assumptions that are not generally made or required. The duplicate answers your second question. – whuber Apr 30 '21 at 12:29

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