Question: Dropping an RHS variable from the OLS fit is equivalent to constraining its coefficient to be zero. This is one way to select unique fitted

Dropping an RHS variable from the OLS fit is equivalent to constraining its coefficient to be zero. This is one way to select unique fitted coefficients when there is multicollinearity such that rank(X) = K-1. Explain how constraining two fitted coefficients to have the same value can also select unique fitted coefficients.

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