Compara mètodes

	Índex de Condició	Regressió Ridge
Camp	Econometria	Aprenentatge automàtic
Família	Regression model	Machine learning
Any d'origen	1980	1970
Autor original	Belsley, Kuh & Welsch	Hoerl, A.E. & Kennard, R.W.
Tipus	Collinearity diagnostic index	L2-regularized linear regression
Font seminal	Belsley, D. A., Kuh, E., & Welsch, R. E. (1980). Regression Diagnostics: Identifying Influential Data and Sources of Collinearity. John Wiley & Sons. ISBN: 978-0-471-05856-4	Hoerl, A.E. & Kennard, R.W. (1970). Ridge Regression: Biased Estimation for Nonorthogonal Problems. Technometrics, 12(1), 55–67.
Àlies	Belsley Condition Index, Collinearity Condition Index, Singular Value Condition Index, Koşul İndeksi	Ridge Regresyonu, ridge regresyonu, L2-regularized regression, Tikhonov regularization
Relacionats	2	4
Resum	The Condition Index, introduced by Belsley, Kuh, and Welsch (1980), is a scalar measure derived from singular value decomposition of the scaled regressor matrix. It quantifies the degree of near-linear dependence among predictors in ordinary least squares regression, enabling analysts to detect collinearity that inflates coefficient variance and destabilises parameter estimates. Widely used in economics, social sciences, and biomedical research wherever OLS regression is applied.	Ridge Regression is an L2-regularized linear regression method, introduced by Arthur Hoerl and Robert Kennard in 1970, that reduces multicollinearity by adding a penalty on the size of the coefficients. It shrinks coefficients toward zero without setting any of them exactly to zero, producing more stable estimates when predictors are highly correlated.