Zero empirical mean

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Consider a data matrix, X, with zero empirical mean.

What is zero empirical mean?

Could someone please give me an example of such matrix?
 
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DUET said:
Consider a data matrix, X, with zero empirical mean.

What is zero empirical mean?

Could someone please give me an example of such matrix?
It would help if would supply context. I presume empirical mean is a term for sample average, but I can't be sure.
 

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