手法を比較

	アンサンブル線形回帰	正則化線形回帰
分野	機械学習	機械学習
系統	Machine learning	Machine learning
提唱年	1996	1970–2005
提唱者	Breiman, L. (bagging framework)	Hoerl & Kennard (Ridge, 1970); Tibshirani (Lasso, 1996); Zou & Hastie (Elastic Net, 2005)
種類	Ensemble of linear models	Penalized linear model
原典	Breiman, L. (1996). Bagging predictors. Machine Learning, 24(2), 123–140.	Tibshirani, R. (1996). Regression shrinkage and selection via the lasso. Journal of the Royal Statistical Society: Series B, 58(1), 267–288.
別名	bagged linear regression, aggregated linear regression, stacked linear models, bootstrap-aggregated OLS	Ridge regression, Lasso regression, Elastic Net regression, penalized regression
関連	6	4
概要	Ensemble Linear Regression combines multiple ordinary least-squares models — each fitted on a different bootstrap sample or feature subset — and averages their predictions. The technique, grounded in Breiman's bagging framework (1996), reduces variance and improves predictive stability compared with a single linear regression fit, while retaining the interpretability of linear assumptions.	Regularized linear regression adds a penalty term to the ordinary least-squares objective, shrinking or zeroing out coefficients to reduce overfitting and handle multicollinearity. The three main variants — Ridge (L2 penalty), Lasso (L1 penalty), and Elastic Net (combined L1+L2) — make linear regression usable even when features outnumber observations or predictors are highly correlated.