KnowraRidge regressionLinked fromLinked fromThe 8 pages that link to Ridge regression, each with the reason it gives.All 8Broader topic 2Related 2Compared with 4Least squaresCompared with: It regularizes least squares when predictors are highly correlated or parameters are unstable.Linear regressionCompared with: Its penalty trades some bias for lower variance, especially with correlated predictors.Ordinary least squaresCompared with: Its penalty trades coefficient bias for reduced variance, unlike unregularized OLS.Frisch–Waugh–Lovell theoremCompared with: Penalization changes coefficient estimates, so ordinary residual-regression equivalence need not hold.