(Table 8.1 near bottom of page)
A correlation matrix describes a correlation among matrix variables. It's basically a table that contains correlation coefficients. The original variables can be directly computed, but I personally do not know how to explain how to compute this nor how to explain how to calculate it. The image above is an example of a correlation matrix of economic variables that are correlated together in simplified mathematics after very complex calculating (when seeing how complex each variable is) and averaging each principal variable.
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