手法を比較

	経験ベイズ	リッジ回帰
分野	ベイズ	機械学習
系統	Bayesian methods	Machine learning
提唱年	—	1970
提唱者	Herbert Robbins (1956); Bradley Efron & Carl Morris (1973)	Hoerl, A.E. & Kennard, R.W.
種類	Empirical Bayes estimator	L2-regularized linear regression
原典	Robbins, H. (1956). An empirical Bayes approach to statistics. In J. Neyman (Ed.), Proceedings of the Third Berkeley Symposium on Mathematical Statistics and Probability, Vol. 1 (pp. 157–164). University of California Press.	Hoerl, A.E. & Kennard, R.W. (1970). Ridge Regression: Biased Estimation for Nonorthogonal Problems. Technometrics, 12(1), 55–67.
別名	EB, empirical Bayes estimation, marginal likelihood estimation, James-Stein shrinkage	Ridge Regresyonu, ridge regresyonu, L2-regularized regression, Tikhonov regularization
関連	4	4
概要	Empirical Bayes (EB) is an estimation strategy, introduced by Herbert Robbins in 1956 and developed into practical shrinkage estimators by Bradley Efron and Carl Morris in 1973, in which the hyperparameters of the prior distribution are estimated from the observed data via the marginal likelihood rather than specified in advance. The resulting posterior retains a Bayesian structure but substitutes data-driven hyperparameters for subjective ones, bridging frequentist shrinkage and full Bayesian inference.	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.