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What is a dummy variable? If we use one on the right-hand side of the equation...

What is a dummy variable? If we use one on the right-hand side of the equation in a multivariate analysis, what are the implications for interpreting the constant?  What is multicollinearity? How do we know if we have it in our models? How do we correct for it if we do?  What is hetereskedasticity? Should we really be concerned about it? Why or why not?

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