手法を比較

	Elastic Net回帰	正則化ロジスティック回帰
分野	統計学	機械学習
系統	Regression model	Machine learning
提唱年	2005	1996–2005
提唱者	Hui Zou and Trevor Hastie	Tibshirani, R. (lasso); Hoerl & Kennard (ridge); Zou & Hastie (elastic net)
種類	Penalized linear regression	Penalized classification model
原典	Zou, H., & Hastie, T. (2005). Regularization and variable selection via the elastic net. Journal of the Royal Statistical Society: Series B (Statistical Methodology), 67(2), 301-320.	Tibshirani, R. (1996). Regression shrinkage and selection via the lasso. Journal of the Royal Statistical Society: Series B, 58(1), 267–288.
別名	elastic net, EN regression, L1+L2 regularized regression, combined lasso-ridge regression	penalized logistic regression, L1 logistic regression, L2 logistic regression, elastic net logistic regression
関連	6	5
概要	Elastic net regression combines the L1 (lasso) and L2 (ridge) penalties into a single regularized regression framework. Controlled by a mixing parameter alpha and a shrinkage strength lambda, it can simultaneously select variables and handle correlated predictors — overcoming key limitations of pure lasso and pure ridge applied alone.	Regularized logistic regression extends standard logistic regression by adding an L1 (lasso), L2 (ridge), or elastic net penalty to the log-likelihood, shrinking coefficients toward zero and preventing overfitting. It is the default choice for binary or multinomial classification when you want interpretable, sparse, or stable coefficient estimates in high-dimensional or collinear feature spaces.