Multicollinearity tests: Farrar-Glauber and Haitovsky (Excel)

How might one detect multicollinearity in a regression model? Two powerful and conceptually simple diagnostic tests exist to identify whether your independent variables are orthogonal, multicollinear, or somewhere in between, namely the Farrar-Glauber test and the Haitovsky test. Today, we are investigating their usability and learning how to apply these in Excel.
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