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Generalized Cross-Validation as a Method for Choosing a Good Ridge Parameter

1979/05/01 by Gene H. Golub, Michael Heath, Michael T. Heath +1 · 3,783 citations
Chemistry · Decision Sciences · Mathematics · #Advanced Statistical Methods and Models #Advanced Statistical Process Monitoring #Applied mathematics #Artificial intelligence #Combinatorics #Computer science #Cross-validation #Estimator #Geology #Geometry #Invariant (physics) #Mathematics #Model selection #Regression #Ridge #Rotation (mathematics) #Selection (genetic algorithm) #Spectroscopy and Chemometric Analyses #Statistics #Truncation (statistics) #Value (mathematics)

paper · doi:10.1080/00401706.1979.10489751

published in Technometrics 21(2), 215-223 (Taylor & Francis)

openalex publication_date 1979/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

Consider the ridge estimate (λ) for β in the model unknown, (λ) = (X T X + nλI)−1 X T y. We study the method of generalized cross-validation (GCV) for choosing a good value for λ from the data. The estimate is the minimizer of V(λ) given by where A(λ) = X(X T X + nλI)−1 X T . This estimate is a rotation-invariant version of Allen's PRESS, or ordinary cross-validation. This estimate behaves like a risk improvement estimator, but does not require an estimate of σ2, so can be used when n − p is small, or even if p ≥ 2 n in certain cases. The GCV method can also be used in subset selection and singular value truncation methods for regression, and even to choose from among mixtures of these methods.

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