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... so on, comes the need of a little linear algebra revision:
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In order to expand the matrixial functions capabilities in MS Excel, you may need to enable: Solver Add-ins 1) Open Excel 2) Press alt TI 3) Download and install at least the plug-in matrix.xla. Perhaps also XRealStats.xlam

Then, the singular value decomposition (SVD), or USV decomposition as previously presented, opens up a whole new avenue of thought... 

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