how to check if my data has unit scale(mean=0,variance =1)
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I have to apply princomp(Matlab) to a feature matrix.But have few queris: 1.How do I check if the feature matrix has unit scale((mean=0,variance =1)? 2.If it has unit scale can I use it directly as raw input to princomp or still do I have to use zscore to standardize it?
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Von Duesenberg
el 11 de En. de 2017
I may be missing something, but it sounds like your answer is contained within your question. If you want to check that your features have zero mean and unit variance, you just have to compute the mean and the variance (with the functions mean and var); and if you find out that they do have zero mean and unit variance, then applying a z-score will have no effect.
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